<tt>
Text previous double character: Ti
</tt>

<ms>
- Instruction: Ti
- Parameter: none
- Return: true if the previous two characters are equal

- Description:
Returns true if the two characters preceding the index are equal, that is, they are doubles. For example, if there is a pair "bb" before the index, the instruction returns true. This instruction does not want any other parameters, since the doubles detected can be any character.

- Examples:

Text string: a
Braille string: 456
Condition: Ti
Description: The character "a" is transcribed with the cell "456" if it is preceded by a pair of equal characters, such as "bb", "ll", "55" etc..
</ms>

<rl>
</rl>

<ck>
01RPVHVNHW4JJH
</ck>

<in>

</in>
