Mathematics verification expression- Mvx

- Instruction: Mvx# - Parameter: # numeric identifier of expression - Return: true if the index is inside the expression - Description: Returns true if the character is inside the expression marked by an identifier. This instruction must be used only in text which has been previously marked with the instruction "Mvw#". The identifier is always an integer. - Examples: Text string: 5 Braille string: 156 Condition: Mvx100 Description: If the character "5" is inside the expression marked with the identifier "100" it is transcribed with the cell "156".