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All answers having "Garfield" as clue:

3 Character Answers:

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CAT

PET



5 Character Answers:

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TOMAT



6 Character Answers:

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FATCAT

PETCAT

TOMCAT



7 Character Answers:

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TOMCATS



8 Character Answers:

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HOUSECAT



10 Character Answers:

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JAMESABRAM



15 Character Answers:

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FORMERPRESIDENT