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All answers having "Rays" as clue:

3 Character Answers:

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RHO



4 Character Answers:

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BETA



5 Character Answers:

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BEAMS

RADII



6 Character Answers:

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MANTAS

PETALS

SHAFTS

SKATES



8 Character Answers:

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SUNBEAMS

SUNLIGHT



15 Character Answers:

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STINGANDCHARLES

UNITSOFSUNSHINE