In each of the following questions, a group of three numbers/symbols is given in each option. Identify the group that does NOT follow the same pattern as the others.

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1. In (a), (b), (c) the letter and the number each go down by $2$ every step.
2. Example: J10 → H8 → F6: letters J→H→F are $-2$ steps; numbers 10→8→6 are $-2$.
3. In (d): Q17 → O15 is $-2$, but O15 → L12 is $-3$ for both letter and number.
4. So (d) breaks the common $-2$ pattern.
FINAL_ANSWER: d

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