Hello David,
Per the Rules of Unified English Braille and the "Standing Alone" rule 2.6.1: A letter or letters-sequence is considered to be "standing alone" if it is preceded and followed by a space, a hyphen or a dash. In the example in Braille Formats 5.3.3 the ance is preceded by a hyphen and followed by a space. Because "ance" is a final letter groupsign, it may only be used when the letters it represents follow a letter, a contraction, a modified letter or a ligatured letter. Hope this helps. 🙂
Jana Hertz