Your task is to choose a certain two-letter word, such that when added to each of the listed below words a new valid English word will be created.
You can add your word as a prefix, a suffix or insert within the given word.
1. All new words must appear in a respectable dictionary.
2. For the less-common words please provide a short definition.
(In reply to computer aided solution
Q: Prior to creating your program, did you know that "at" is the 2-letter word in the solution, - or you made the decision after inspecting the comprehensive list?