What is the next term of the letter series - YB/W, WD/S, UF/O, SH/K, ?

Answer 1

QJ/G

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English alphabet sequence number is the key:
YB/W, WD/S, UF/O, SH/K, ?
25-2/23, 23-4/19, 21-6/15, 19-8/11, 17-10/7 = QJ/G