Cards
Robbie Buckingham
To clue letter substitution:
Each card represents a letter.
A of C: A 2 of C: B 3 of C: C ... K of C: M A of D: N 2 of D: O ... Q of D: Y K of D: ZSubstituting in gives nine nine-letter words:
camcorder cameraman dermatome durometer expending matertera nonending nonexpert oystermanEach of the words can be split up into three trigrams (i.e. cam cor der). Each of the trigrams appears twice in the puzzle, except for cor, dur, and oys. This clues the answer CORDUROYS.