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All answers having "Matter" as clue:

3 Character Answers:

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RES



4 Character Answers:

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CASE



5 Character Answers:

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ATOMS

COUNT

ISSUE

STUFF

TOPIC



6 Character Answers:

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AFFAIR

DOESNT

OFFACT



8 Character Answers:

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BUSINESS



13 Character Answers:

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AFTERAFASHION

MEANSOMETHING



15 Character Answers:

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BEOFCONSEQUENCE

MAKEADIFFERENCE