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All answers having "Mammoth ___" as clue:

3 Character Answers:

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BIG



4 Character Answers:

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CAVE

HUGE

VAST



5 Character Answers:

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GIANT

JUMBO



6 Character Answers:

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WOOLLY



7 Character Answers:

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IMMENSE

TITANIC



8 Character Answers:

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COLOSSAL

ENORMOUS

GIGANTIC



11 Character Answers:

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ELEPHANTINE