Which of the following letter number-clusters will replace the question mark (?) in the given series to make it logically complete?
FI31 EH39 DG47 CF55 ?
ABF63
BBE63
CBE64
DBF64
ABF63
BBE63
CBE64
DBF64
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ശ്രേണിയിലെ അടുത്ത സംഖ്യയേത്?
1, 2, 5, 26, ----