Translation software is fallible. There are many times I have second-guessed myself because of my translation software. While it is a valuable tool when transcribing, we must always be on the alert for exceptions. The rule that you sited below, details in great length where a contractions may [u]not[/u] be used. An abbreviation (such as P.M.)is not included in this listing. As such, if not delineated in the Nemeth Code, you revert to the rules of English braille, where you would find that you [u]should[/u] use the contraction for the word to prior to an abbreviation.