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All answers having "Prosaic" as clue:

3 Character Answers:

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DRY



4 Character Answers:

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BLAH

DRAB



5 Character Answers:

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VAPID



6 Character Answers:

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STODGY



7 Character Answers:

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HUMDRUM

LITERAL



8 Character Answers:

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ORDINARY



10 Character Answers:

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LACKLUSTRE

PEDESTRIAN

UNORIGINAL



12 Character Answers:

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MATTEROFFACT