Correct: unpack, unsafe, unopened, unfair, unable, unlock, undo, unzip, unwrap, unfold, unstick, unpaid, unkind, unknown, unlike, uneaten, unafraid, unclean, uncover, unfriendly, Incorrect: pack, safe, opened, fair, able, lock, do, zip, wrap, fold, stick, paid, kind, known, like, eaten, afraid, clean, cover, friendly,

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