Previous index merged- Ia

- Instruction: Ia - Parameter: none - Return: true if the previous word has been merged using the "Iu" or "Ij" instruction - Description: Returns true if in the previous code the index has been merged (Iu or Ij instruction). This is a boolean instruction that does not change the index. - Examples: Text string: a Braille string: 456 Condition: Ia Description: If the previous transcription code generated a union of words, the letter "a" is transcribed with the cell "456".