In ONM, SQR, UTS, ZMV, QPO: each triplet shows consecutive letters with 1-letter gaps (O-N-M, S-R-Q, U-T-S). For ZMV, Z to M is NOT consecutive with a 1-letter gap - after Z comes A, not M. The pattern in all others is: letter X, then (X-1), then (X-2) in alphabetical order. ZMV breaks this because Z to M skips 12 letters, not 1 letter like the others.