braille module 45 letter indicator and letter/number...

Braille Module 45 Letter Indicator and Letter/Number Combinations LOC Literary Lesson 12, Sections 12.1-12.4

PROFITT Curriculum Module # 45– Letter Indicator and Letter/Number Combinations

Braille Module 45-1

Braille Module 45 Letter Indicator and Letter/Number Combination

LOC Literary Lesson 12.1-12.4

Summary

Goal(s): The goal is for the students to gain an understanding of letter indicators, distinguishing names and other words from short-form words, letter/number combinations, and summary.

SMART Objectives: Specific, Measurable, Achievable, Realistic, and Time-sensitive

By the end of this module, students

should:

BS45.1: Demonstrate a growing proficiency and understanding of the rules for the letter indicator.

BS45.2: Know the rules for distinguishing names and other words from short-form

words.

BS45.3: Know the rules for letter/number combinations.

BS45.4: Establish an understanding of the governing rules for the letter indicator

through the summary.

BS45.5: Review and test on the letter

indicator.

Instructor:

Braille instructor

Delivery Method(s):

Lecture Classroom reading Discussion One-on-one reading Hands on

Length: 5 hours Five topics

Any Applicable Business and/or Soft Skills:

Corresponding LOC Manual: Lesson 12.1 with EBAEII.12 Lesson 12.2 with EBAEII.12.a(3) Lesson 12.3 with EBAE II.12.a(1) Lesson 12.4

Take Away Message(s): This lesson taught you how to aptly apply the letter indicator. It is so important to remember when to use or not use the letter indicator so the blind read can tell what the letters represents. Memorizing the rules will help you to succeed in this task. “To learn to read is to light a fire; every syllable that is spelled out is a spark.” — Victor Hugo Always keep in mind the wonderful work you are doing and how it helps others.


Braille Module 45-2

Instructor Preparation

Title of Module: Letter Indicator and Letter/Number Indicator

The purpose for this module is for the students to demonstrate their knowledge of the letter indicator, distinguishing names and other words from short-form words, and letter/number combinations. The students will also review the summary of when to and

not to use the letter indicator.

Agenda – Literary Lesson 12.1-12.4

Topic: Letter Indicator and Letter/Number Indicator Time Allotted: 5 hours

A. Dot Formation and the Letter Indicator (2 hours)

B. Distinguishing Names and Other Words from Short-Form Words (15 minutes)

C. Letter and Number Combinations (15 minutes)

D. Summary (1.5 hours)

E. Review and Test (1 hour)

Materials and Supplies – items needed in order to carry out the agenda and classroom activities

1. LOC Manual

2. Drill book

3. EBAE

4. Handouts and Answer Sheets: Summary (45.D.1), Lesson 12.1-4.2: Test (45.E.1), and Answers to Lesson 12.1-4.2: Test (45.E.2)

5. You will need copies of the Proofreading Error sheet from Module 6 (6.A.1).

6. You will need copies of assorted magazines and newspapers.

Classroom Preparation

1. Each workstation should have a computer, a braille writer, a slate and stylus, an LOC Manual, EBAE, a means of communicating with the embosser (network or thumb drive), braille paper (not-tractor feed), a braille eraser, pen/pencil, notebook, and highlighter.

2. Have chalk and erasure board ready for use.


Braille Module 45-3

Curriculum Content

A. Dot Formation and the Letter Indicator (2 hours)

Objective BS45.1: Demonstrate a growing proficiency and understanding the rules for the

letter indicator.

PREINSTRUCTIONAL ACTIVITIES

The instructor will be familiar with Lesson LOC Manual: Lesson 12.1 and EBAE II.12 which

covers the letter indicator. They will also be familiar with Drill 30.

You will need copies of: magazines and newspapers.

You will need copies of the Proofreading Error sheet (6.A.1) from Module 6.

CONTENT PRESENTATION AND LEARNER PARTICIPATION

As a class the students will read and discuss LOC Manual: Lesson 12.1 about the letter

indicator.

Some reminders to the students:

“Remember that the letter indicator is a composition sign. A letter indicator is used

to show that a letter is not a whole-word contraction or a short-form word.

Therefore the students will be able to tell what the braille character is by whether

there is a letter indicator or not. Study the rules so that you will be able to clearly

present the text in the braille transcription.

Remember that from now on you will not be dividing words at the end of the linein

drills, exercises, or your certification manuscript.”

As a class the students will read the braille (embossed) answers to Drill 30 from the Drill

book. This will help the students to get a visual idea of reading the embossed copy.

Next students will complete Drill 30 on Page 12-5 using Perky Duck.

Some reminders to the students before they transcribe Drill 30:

“Things to watch for when using braille translation software:

Single letters before periods

Quotes around single letters

Letters a, i, and o when used as letters instead of words

The translator will keep the contractions and, for, of, the, with and the word

a “cuddled” on one line, though LOC expects them to be divided between


Braille Module 45-4

lines if space allows. The general practice in the field, however, is to follow

the translator on this rule.

but-can-do contractions preceded by a number and a hyphen

You will want to make sure you use a letter indicator when necessary.”

When the students have completed this activity, which includes proofreading their own work, they can exchange drills and proofread each other’s work using the “How to Successfully Proofread” steps.

The instructor will allow the students to pick out magazine or a newspaper to structure.

The students will look for and highlight the letters that pertain to this lesson. The students

are to write the applicable rule over the letter or word found. Set aside 30 minutes for the

students to find these items.

Some reminders to the students (write the list on the board):

“Here are some examples to help you:

X marks the spot. E Coli can be deadly. Aaron plays rock ‘n’ roll.

In the first example the letter indicator will be needed for the letter X.

X marks the spot. 12.1a

In the second example the letter indicator will be needed for the letter E.

E Coli can be deadly. 12.1f

In the third example the letter indicator will not be needed for the letter n.

Aaron plays rock ‘n’ roll. 12.1d(2)

Now, select an article in the magazine or newspaper you to look for items that

apply to the rules for the letter indicator. Highlight these items and write the rule

that it applies to. When you have completed this activity you will present to the

class your findings.”

When they have finished with the part of a text they have chosen they are to take turns at

the board and write out the sentences they found. They are to show the class whether

they used the letter indicator or not.


Braille Module 45-5

ASSESSMENT

This activity will help the student to test their knowledge of the rules pertaining to the

letter indicator.

B. Distinguishing Names and Other Words from Short-Form Words (15 minutes)

Objective BS45.2: Know the rules for distinguishing names and other words from short-form words.


The instructor will be familiar with Lesson LOC Manual: Lesson 12.2 and EBAE II.12.a(3)

which covers distinguishing names and other words from short-form words.


As a class the students will read and discuss LOC Manual: Lesson 12.2 and EBAE II.12.a(3)about distinguishing names and other words from short-form words.


“Remember that if the context is perfectly clear and no such confusion is possible,

do not use a letter indicator.”

C. Letter/Number Combinations (15 minutes)

Objective BS45.3: Know the rules for letter/number combinations.


The instructor will be familiar with Lesson LOC Manual: Lesson 12.3 and EBAE II.12.a(1)

which covers letter/number combinations.


As a class the students will read and discuss LOC Manual: Lesson 12.2 and EBAE II.12.a(1) about letter/number combinations.


“Remember:

use a letter indicator before the s in plural numbers printed without an apostrophe.

a hyphen does not terminates the effect of the number indicator.

a slash does not terminates the effect of the number indicator.


Braille Module 45-6

Use a letter indicator before a letter, or a letter grouping, that immediately follows

a number

a number and a hyphen

a slash

Can you use contractions in random combinations of numbers and letters? No, they are not used in random combinations.

Is a letter indicator used where the number is immediately followed by letters or a part-word contraction, as in 2nd and 4th? No, because context makes the meaning

clear.

Does a period terminate the effect of the number indicator? Yes

Would you use a letter indicator in 7-Up? No, a letter indicator is not required

unless all of the letters of the word could be misread as a number.

Can the contraction for can be used in 12-can case? No. Why? It would be read as 12-3.”

D. Summary (1.5 hours)

Objective BS45.4: Establish an understanding of the governing rules for the letter indicator

through the summary.


The instructor will be familiar with Lesson LOC Manual: Lesson 12.4 which covers the summary of the rule governing the use of the letter indicator. They will also be familiar

with Drill 31.

You will need copies of the Proofreading Error sheet from Module 6 (6.A.1).

You will need copies of the Summary (45.D.1) printed on 8 ½ by 11 in. card stock

paper.


As a class the students will read and discuss LOC Manual: Lesson 12.4 which covers the summary of the rule governing the use of the letter indicator.

Next students will complete Drill 31 on Page 12-9 using Perky Duck.

Some reminders to the students before they transcribe Drill 31:

“Remember to thoroughly structure your print copy prior to transcription. Underline in red the letters/words you are not able to use. This reminder will help you to


Braille Module 45-7

remember NOT to use it when you are transcribing. Proofread your own work

before handing it to someone else to proofread.

The letter indicator probably generates more questions on a day-to-day basis than

any other area of the literary braille code. Make sure that you mark Lesson 12.4,

which is the summary, in your manual with some sort of tab because you will

reference it frequently. You will also make a help sheet that will be available at your

fingertips.

When you are able to use a program that has a translator you will need to be

aware that it will not always insert the letter indicator when needed. You cannot

trust the translator completely to handle each situation perfectly. You will need to

know the rules in order to use the letter indicator correctly. Now is a good time to

become familiar with the rules.”

When the students have completed this activity, which includes proofreading their own work, they can exchange drills and proofread each other’s work using the “How to

Successfully Proofread” steps.

The students will make a help sheet for the Summary on when to use and not use the letter indicator. This will be handy for the student as they do their drills, exercises and other transcriptions in the future.

Have the students make help sheets using the template on card stock paper.


“Use this help sheet anytime you have a question concerning the letter indicator. This will help you to know when to use this composition sign so the braille reader will know what a character is and can read with ease. It is very important that you

know the rules for the letter indicator so the text will be clear.”

ASSESSMENT

Allow adequate time to ask the group to report some of their thoughts about this lesson.

The instructor will assess the student’s ability to grasp the rules studied in this lesson.

Through the following test the instructor will be able to see areas they will need help with.

E. Review and Test (1 hour)

Objective BS45.5: Review and test on the letter indicator.


Braille Module 45-8


The instructor will be familiar with sections 12.1-12.4 of the LOC Manual and the test

created for students.

The handout needed for this section is: Lesson 12.1-12.4: Test (45.E.1) and Answers to Lesson 12.1-12.4: Test (45.E.2).


The review includes sections 12.1-12.4 of the LOC Manual. The review is designed to

prepare the students for the following test. The instructor is to go over each section with

emphases on areas that will be on the test. Allow the students to ask any questions

pertaining to the context of Lesson 12.1-12.4. Answer any questions.

The instructor will pass out Lesson 12.1-12.4: Test (45.E.1) and explain that this test consists of 38 True or False questions. An answer key is included. This test may be used

as an open book test. Allow for time for questions and answers.

ASSESSMENT

This test is necessary for the students and the instructor to determine the knowledge

acquired over Lesson: 12.1-12.4 of the Instruction Manual for Braille Transcribing, Fifth

Edition, 2009. It is expected that the students will fully grasp the braille rules for the

letter indicator, distinguishing names and other words from short-form words,

letter/number combinations and knowledge of the Summary so as to continue with the

lessons. This test will help both the teacher and the students to understand the students’

strengths and weaknesses. The outcome will allow the instructor and the student to work

together to strengthen the students weaknesses in any area.

Best Practices

1. Discuss the importance of recognizing the hierarchy for choosing between contractions.

2. Discuss the Braille Enthusiast’s Dictionary. The dictionary is a comprehensive, easy-to-

use reference for the braillist. The address to purchase one is: SCALARS Publishing,

P.O. Box 382834, Germantown, TN 38183-2834


Braille Module 45-9

Braille Module 45 Letter Indicator and Letter/Number Combinations LOC Literary Lesson 12, Sections 12.1-12.4 Handouts and Answer Sheets


Braille Module 45-10

Summary (45.D.1)

Use the Letter Indicator 1. With all single letters that mean letters, not words. [Class B] 2. With single letters followed by 's. [p's and q's] 3. Befores in plural numbers. [1800s] 4. With letters that represent shapes. [aVed formation] 5. With single letters joined to words by a hyphen or dash. [x-ray] 6. With single letters joined to other single letters by a hyphen or dash. [a-j A-J] 7. With single enclosed letters in regular text (drop enclosure symbols). [(a) "b"] 8. With unpunctuated letters in outlines and lists. 9. With names, words, or letter groupings that could be mistaken for short-form words. 10. With letters that follow a number and a slash. [35/B] 11. With any single letter connected to a number by a hyphen. [c-4 4-C] 12. With a letter or letter grouping immediately following a number, or following a number and a hyphen. [6MG 6-mg] 13. With letter groupings joined to a number by a hyphen that could be mistaken for a short-form word. [Fr-10 6-ab] 14. With single-letter abbreviations or initials that are not followed by a period or colon. 15. With lowercase roman numerals and foreign ordinal numbers (to be studied later).

Do Not Use the Letter Indicator

1. With the words a, I, and O. 2. With letters that are followed or preceded by an apostrophe, hyphen, or dash

indicating omitted letters. [Fish 'n' Chips d--n] 3. With letters in contact with a slash and other letters. [s/he] 4. With letters designating topics in outlines or listings if they are followed by or enclosed in punctuation. 5. With letter groupings that could not be mistaken for a short-form word. [XYZ] 6. With words, names, or letter groupings that correspond to short-form words, but,

because of context, could not be mistaken for one. 7. With a contraction that immediately follows a number, as in ordinal numbers. [1st

4th] 8. With any letter that is immediately followed by a number, or a slash and a number.

[M6] 9. With letter groupings followed immediately by a number, or by a hyphen and a

number, that will not be confused with a short-form word. [TY60 ty-60] 10. With words following a number and a hyphen, unless all of the letters of the word

could be misread as a number. [6-pack] 11. In numbers followed by a lettered suffix. [911ed] 12. In stammered words. [b-b-boy] 13. With initials and abbreviations followed by periods or a slash (to be studied later). 14. With italicized single-letter foreign words (to be studied in Lesson 16.)

45.D.1



Lesson 12.1-12.4: Test (45.E.1)

Highlight True or False.

1. The letter indicator is used to indicate that a letter or letter grouping has a letter meaning, and is not a whole-word contraction or a short-form word. True or False

2. The letter indicator is also used to differentiate between letters and numbers and with

roman numerals. True or False

3. Place a letter indicator immediately after a single letter that stands alone and is not

followed by a period indicating an abbreviation. True or False

4. Do not use the letter indicator before the words a, I, and O. True or False

5. Use a letter indicator before any single letter that means a letter when it is joined to a word by a hyphen so that it won't be misread as a one-cell, part-word contraction. True or False

6. Use a letter indicator before a letter that stands for a letter when it is preceded by an

apostrophe and s. True or False

7. Use the contractions for to, into, and by before a single letter. True or False

8. If letters follow a number and a slash, a letter indicator is not required because the

slash does not terminate the effect of the number indicator. True or False

9. Do use a letter indicator before any letter grouping in contact with a slash that could be misread as a short-form word. True or False

10. When a hyphen or a dash joins letters of the alphabet, a letter indicator precedes each letter. True or False

11. Do not use a letter indicator before a letter that is preceded and/or followed by an

apostrophe when the apostrophe indicates a missing letter in a word. True or False

12. When a single letter, or a letter with a suffix, indicates an unknown quantity or the

shape of something, a letter indicator clarifies the meaning. True or False

13. Place a letter indicator before a single-letter abbreviation that is not followed by punctuation so that it will not be mistaken for a whole-word contraction. True or

False

14. If a single letter or letter grouping is enclosed in quotation marks, parentheses, brackets, or is printed in italics and such enclosures or typeface changes have no other purpose than to distinguish the letter or letters — in braille, the letter indicator

45.E.1



is used to keep it from being read as a whole-word contraction or a short-form word, and the enclosing punctuation marks and typeface changes are not ignored. True or False

15. Do not use a letter indicator before single letters that are in contact with a slash and

other letters. True or False

16. A letter indicator is used for letter groupings, such as vocal expressions, plurals of letters, and abbreviations, when they could be confused with short-form words or contractions. True or False

17. It should be kept in mind that the purpose of the letter indicator is to avoid confusion of letters or letter combinations with numbers, contractions, or short-form words.

True or False

18. Unlike enclosed letters in regular text, the enclosing punctuation is retained for lettered in or referring to, outlines and lists the letter indicator is not used unless such letters are not in contact with any type of punctuation. This applies whether

the items are listed vertically or horizontally. True or False

19. Use a letter indicator before names, such as Al and Ab, and words that have the same spelling as short-form words when they fall at the beginning of a sentence, quotation, or line of poetry, or in fully capitalized text. True or False

20. When deciding whether or not something is clear in context, remember that what might seem clear to a sighted reader is not always obvious to the braille reader

because the braille reader cannot see the surrounding text. True or False

21. In the sentence "TN is the postal abbreviation for Tennessee." a letter indicator before the TN quickly identifies the letters as an abbreviation and not the short-form

for tonight. True or False

22. Use a letter indicator before the s in plural numbers printed without an apostrophe.

True or False

23. It would be necessary to use the letter indicator before TN in a list of Tennessee

addresses. True or False

24. Remember that neither the hyphen nor the slash terminates the effect of the number indicator. True or False

25. If the context is perfectly clear and no such confusion is possible, use a letter

indicator. True or False

26. To alert the reader that numbers have stopped and letters have begun, use a letter indicator before a letter, or a letter grouping, that immediately follows a number or a number and a hyphen or a slash. True or False

45.E.1



27. When a number and a word are joined by a hyphen, as in 6-pack or 7-Up, a letter indicator is required unless all of the letters of the word could be misread as a number. True or False

28. Contractions are used in random combinations of numbers and letters. True or

False

29. In ordinal numbers and numbers that are treated as nouns and verbs where the number is immediately followed by letters or a part-word contraction, as in 2nd and 4th. Because context makes the meaning clear, a letter indicator is not used in these instances. True or False

30. The letter indicator is placed before the capital indicator. True or False

31. When a single letter is followed immediately by a number, or a slash and a number,

a letter indicator is required. True or False

32. When the letter d standing alone has the whole word meaning do, but if a letter

indicator precedes it, it is read as the letter d. True or False

33. A single letter followed by a hyphen and a number needs a letter indicator so that

the letter will not be misread as a whole-word contraction. True or False

34. The letter indicator (dots 23) is another composition sign. True or False

35. Remember that whole-word contractions are used next to a slash, but they are used in hyphenated-compound words. True or False

36. Do not place a letter indicator before the letters a, i, and o when they stand for

letters, even though these letters have no contracted meaning. True or False

37. When a letter grouping is followed by a number, or a hyphen and a number, use a letter indicator only if such letters could be mistaken for a number or a short-form

word. True or False

38. Remember that a period does terminate the effect of the number indicator. Thus, when a letter immediately follows a number and a period, do not use a letter

indicator. True or False

45.E.1



Answers to Lesson 12.1-12.4: Test (45.E.2)

Highlight True or False.

1. The letter indicator is used to indicate that a letter or letter grouping has a letter meaning, and is not a whole-word contraction or a short-form word. True or False

Rule 12.1

2. The letter indicator is also used to differentiate between letters and numbers and with

roman numerals. True or False Rule12.1

3. Place a letter indicator immediately after a single letter that stands alone and is not followed by a period indicating an abbreviation. True or False Rule 12.1a (before)

4. Do not use the letter indicator before the words a, I, and O. True or False Rule 12.1b

5. Use a letter indicator before any single letter that means a letter when it is joined to a word by a hyphen so that it won't be misread as a one-cell, part-word contraction.

True or False Rule 12.1d(1) whole-word

6. Use a letter indicator before a letter that stands for a letter when it is preceded by an

apostrophe and s. True or False Rule 12. 1d(2) followed by

7. Use the contractions for to, into, and by before a single letter. True or False Rule 12.1c

8. If letters follow a number and a slash, a letter indicator is not required because the slash does not terminate the effect of the number indicator. True or False Rule 12.

1d(3) a letter indicator is required

9. Do use a letter indicator before any letter grouping in contact with a slash that could

be misread as a short-form word. True or False Rule 12. 1d(3)

10. When a hyphen or a dash joins letters of the alphabet, a letter indicator precedes

each letter. True or False Rule 12. 1d(1)

11. Do not use a letter indicator before a letter that is preceded and/or followed by an apostrophe when the apostrophe indicates a missing letter in a word. True or False

Rule 12. 1d(2)

12. When a single letter, or a letter with a suffix, indicates an unknown quantity or the

shape of something, a letter indicator clarifies the meaning. True or False Rule 12. 1e

13. Place a letter indicator before a single-letter abbreviation that is not followed by punctuation so that it will not be mistaken for a whole-word contraction. True or False Rule 12.1f

45.E.2



14. If a single letter or letter grouping is enclosed in quotation marks, parentheses, brackets, or is printed in italics and such enclosures or typeface changes have no other purpose than to distinguish the letter or letters — in braille, the letter indicator is used to keep it from being read as a whole-word contraction or a short-form word, and the enclosing punctuation marks and typeface changes are not ignored. True or False

Rule 12.1g(1) the enclosing punctuation marks and typeface changes are ignored.

15. Do not use a letter indicator before single letters that are in contact with a slash and other letters. True or False Rule 12. 1d(3)

16. A letter indicator is used for letter groupings, such as vocal expressions, plurals of letters, and abbreviations, when they could be confused with short-form words or

contractions. True or False Rule 12.2

17. It should be kept in mind that the purpose of the letter indicator is to avoid confusion of letters or letter combinations with numbers, contractions, or short-form words. True

or False Rule 12.2

18. Unlike enclosed letters in regular text, the enclosing punctuation is retained for lettered in or referring to, outlines and lists. The letter indicator is not used unless such letters are not in contact with any type of punctuation. This applies whether the items are listed vertically or horizontally. True or False Rule 12.1g(2)

19. Use a letter indicator before names, such as Al and Ab, and words that have the same spelling as short-form words when they fall at the beginning of a sentence, quotation,

or line of poetry, or in fully capitalized text. True or False Rule 12.2

20. When deciding whether or not something is clear in context, remember that what might seem clear to a sighted reader is not always obvious to the braille reader

because the braille reader cannot see the surrounding text. True or False Rule 12

21. In the sentence "TN is the postal abbreviation for Tennessee." a letter indicator before the TN quickly identifies the letters as an abbreviation and not the short-form for

tonight. True or False Rule 12.2

22. Use a letter indicator before the s in plural numbers printed without an apostrophe. True or False Rule 12.3a

23. It would be necessary to use the letter indicator before TN in a list of Tennessee

addresses. True or False Rule 12.2 It would not be necessary

24. Remember that neither the hyphen nor the slash terminates the effect of the number

indicator. True or False Rule 12.3b

25. If the context is perfectly clear and no such confusion is possible, use a letter

indicator. True or False Rule 12.2 do not use a letter indicator

45.E.2



26. To alert the reader that numbers have stopped and letters have begun, use a letter indicator before a letter, or a letter grouping, that immediately follows a number or a number and a hyphen or a slash. True or False Rule 12.3b

27. When a number and a word are joined by a hyphen, as in 6-pack or 7-Up, a letter indicator is required unless all of the letters of the word could be misread as a number.

True or False Rule 12.3c is not required

28. Contractions are used in random combinations of numbers and letters. True or False

Rule 12.3b Contractions are not used

29. In ordinal numbers and numbers that are treated as nouns and verbs where the number is immediately followed by letters or a part-word contraction, as in 2nd and 4th. Because context makes the meaning clear, a letter indicator is not used in these

instances. True or False Rule 12.3b

30. The letter indicator is placed before the capital indicator. True or False Rule 12.1a

31. When a single letter is followed immediately by a number, or a slash and a number, a

letter indicator is required. True or False Rule 12.3d is not required

32. When the letter d standing alone has the whole word meaning do, but if a letter indicator precedes it, it is read as the letter d. True or False Rule12.1

33. A single letter followed by a hyphen and a number needs a letter indicator so that the

letter will not be misread as a whole-word contraction. True or False Rule 12.3d

34. The letter indicator (dots 23) is another composition sign. True or False Rule 12.1

(dots 56)

35. Remember that whole-word contractions are used next to a slash, but they are used in hyphenated-compound words. True or False Rule 12.3d are not used

36. Do not place a letter indicator before the letters a, i, and o when they stand for letters, even though these letters have no contracted meaning. True or False Rule

12.1b Place a letter …

37. When a letter grouping is followed by a number, or a hyphen and a number, use a letter indicator only if such letters could be mistaken for a number or a short-form word. True or False Rule 12.3d

38. Remember that a period does terminate the effect of the number indicator. Thus, when a letter immediately follows a number and a period, do not use a letter indicator.

True or False Rule 12.3b

45.E.2

braille module 45 letter indicator and letter/number...

Documents