In the following question, which one set of letters when sequentially placed at the gaps in the given letter series shall complete it?
a _ bc _ a _ bcdabc _ da _ cd _
Expression : a _ bc _ a _ bcdabc _ da _ cd _
In groups of five, the first four letters of English alphabets are repeated with each letter written twice in every group.
=> aabcd abbcd abccd abcdd
=> Ans - (B)
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