Step 1: Analyze the position of each letter in the word.
HEM → H(8), E(5), M(13) → no common gap or symmetry
NKS → N(14), K(11), S(19) → reverse symmetry (14 → 11, 11 → 19)
JGP → J(10), G(7), P(16) → roughly symmetrical gap
OLT → O(15), L(12), T(20) → similar to JGP pattern
Step 2: HEM does not follow a symmetric or consistent alphabetical gap. Others do.