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All answers having "Beneficial" as clue:

3 Character Answers:

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RHO



4 Character Answers:

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GOOD



5 Character Answers:

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OFUSE

UTILE



6 Character Answers:

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OFHELP

USEFUL



7 Character Answers:

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HELPFUL

OFVALUE



8 Character Answers:

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SALUTARY

SANATIVE



12 Character Answers:

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ADVANTAGEOUS