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All answers having "Obviously!" as clue:

3 Character Answers:

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DUH

YES



5 Character Answers:

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NATCH

NODUH



6 Character Answers:

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SOISEE



7 Character Answers:

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OVERTLY



8 Character Answers:

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IREALIZE

PATENTLY



11 Character Answers:

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ASYOUCANSEE

ICANSEETHAT