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All answers having "Tests" as clue:

4 Character Answers:

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ASKS

TOES



5 Character Answers:

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EXAMS

FEELS

ORALS

TRIES



6 Character Answers:

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ASSAYS

TRIALS



8 Character Answers:

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COQAUVIN

EXAMINES

TRIESOUT



9 Character Answers:

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TRIALRUNS