Back index- I

- Instruction: I-%

- Parameter: "%" (optional) value from 1 to 9

- Return: none

- Description:

Decreases the index by "%" positions. The index is a position variable that analyzes the characters of the line. It runs through the text in order to translate it into braille. This instruction causes the index to move backward by "%" positions. If the "%" parameter is not specified, the index will move back one position.

- Examples:

Text string: b

Braille string: 456

Condition: I-Cpb

Description: The character "b" is transcribed with the cell "456" if there is another "b" two positions further back.

Text string: b

Braille string: 456

Condition: I-4 Cpb

Description: The character "b" is transcribed with cell "456" if there is another "b" more than five positions behind.