Correct: Aa, Bb, Cc, Dd, Ee, Ff, Gg, Hh, Incorrect: AB, CD, EF, GH, ab, cd, ef, gh, Ad, Af, Bd, Bh, Ca, Ce, Db, Dg, Ec, Ef, Fe, Fb, Gh, Gd, Ha, Hg,

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