Find the missing (?) in the series TUS, QRP, ?, KLJ, HIG

Find the missing (?) in the series TUS, QRP, ?, KLJ, HIG Correct Answer NOM

The logic here is:

every set of letters follows the logic: x : x + 1 : x - 1 now (x - 1) - 1 forms the middle letter of next set.

TUS: T, T + 1, T - 1 : Next set: (T - 1) - 1 i.e., R will be the middle letter of next set.

QRP: Q, Q + 1, Q - 1 : Next set: (Q - 1) - 1 i.e., O will be the middle letter of next set

NOM: N, N + 1, N - 1 : Next set: (N - 1) - 1 i.e., L will be the middle letter of next set.

KLJ: K, K + 1, K - 1 : Next set  (K - 1) - 1 i.e., I will be the middle letter of next set.

HIG: 

HIG: H, H + 1, H - 1 : Next set  (H - 1) - 1 i.e., F will be the middle letter of next set.

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