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All answers having "Congratulations" as clue:

3 Character Answers:

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PAT



4 Character Answers:

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PATS



5 Character Answers:

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BRAVO

KUDOS



6 Character Answers:

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BRAVOS

HURRAY



8 Character Answers:

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MAZELTOV

TAKEABOW



10 Character Answers:

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GOODFORYOU