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All answers having "Elementary" as clue:

4 Character Answers:

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EASY

RUDE



5 Character Answers:

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BASAL

BASIC



6 Character Answers:

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ABBOTT

FOLLOW

KEEPER

PRIMAL

SIMPLE



7 Character Answers:

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ERRATIC



8 Character Answers:

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ATOMICAL



11 Character Answers:

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ABECEDARIAN

SIMPLEASABC