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All answers having "Fraternity letters" as clue:

3 Character Answers:

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MUS

NUS

PIS

XIS



4 Character Answers:

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ETAS

PHIS

PSIS

RHOS

TAUS



5 Character Answers:

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BETAS

IOTAS

ZETAS



6 Character Answers:

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DELTAS

OMEGAS

SIGMAS