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All answers having "___ cards" as clue:

3 Character Answers:

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CUE

IDS



4 Character Answers:

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ACES

MAIL

TENS

TWOS

WAGS

WITS



5 Character Answers:

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NINES

SIXES

TAROT

TREYS



6 Character Answers:

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CUTUPS

DEUCES

JOKERS

KNAVES

SEVENS



7 Character Answers:

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POSTALS



18 Character Answers:

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STLOUISANDGREETING



21 Character Answers:

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GREETINGLIBRARYCREDIT



23 Character Answers:

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STLOUISPOSTALANDPLAYING