It is not actually Nemeth Code that will not allow contractions -- it is UEB that prohibits contractions within the Nemeth switches. Everything within the switches is presumed to be mathematical, so no contractions. The only contractions allowed would be when the single-word switch is used within the mathematical part for one non-mathematical word. When the opening Nemeth switch indicator is inserted, everything that follows will be according to the Nemeth Code. Outside of the switches, everything is UEB. When transcribing a technical book (science, math, statistics, etc) the formatting will follow the method established for Nemeth in conjunction with Braille Formats (posted on BANA's website). Hope this explains somewhat.