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All answers having "Coin-___" as clue:

3 Character Answers:

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OPS

SOU



4 Character Answers:

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CENT

DIME

ICON

MINT

PESO

RIAL

TOSS



5 Character Answers:

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ICENT

PENNY



6 Character Answers:

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COPPER

FLORIN

INSERT

INVENT

NICKEL

SPECIE



7 Character Answers:

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APHRASE

PIASTER