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All answers having "Far out!" as clue:

3 Character Answers:

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RAD

WOW



4 Character Answers:

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COOL

NEAT



5 Character Answers:

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NEATO

OUTRE

ULTRA



6 Character Answers:

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UNREAL



7 Character Answers:

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AWESOME

EXTREME

EXURBAN

INACOMA

RADICAL



8 Character Answers:

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EXTENDED



9 Character Answers:

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WHATATRIP