DHL, PTX, BFJ,?

More Questions from Series Completion

• A, CD, GHI,?, UVWXY
• Z, Y, X, U, T, S, P, O, N, K,?,?
• U, B, I, P, W,?
• AI, BJ, CK,?
• _ stt _ tt _ tts _
• gfe _ ig _ eii _ fei _ gf_ ii
• _ a _ b _ abaa _ bab _ abb
• abca _ bcaab _ ca _ bbc _ a
• _ tu _ rt _ s _ _ usrtu _
• _ _aba _ _ ba _ ab

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