Find the odd one out among the following:

Concept:

In an “odd one out” letter-group puzzle, every group is built by the SAME internal rule. A reliable rule to test is the sequence of forward gaps — the positional jump (A=1, B=2, …, Z=26) between each letter and the next. The group whose gap sequence does not match the others is the odd one out.

Application — compute the gap sequence of each group:

1. D→f→G→j: positions 4→6→7→10, so gaps are +2, +1, +3.

2. H→k→L→o: positions 8→11→12→15, so gaps are +3, +1, +3.

3. M→o→P→s: positions 13→15→16→19, so gaps are +2, +1, +3.

4. T→v→W→z: positions 20→22→23→26, so gaps are +2, +1, +3.

Cross-check: Three groups share the identical gap sequence +2, +1, +3. Only the group spelling H, k, L, o opens with a +3 gap (H to k jumps three places) instead of +2, breaking the shared rule.

Result: The group H, k, L, o is the odd one out.