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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Letter on a frat house:

IOTA: Frat-house letter
TAU: Frat house letter
SIGMA: Frat house letter
RHO: Frat-house letter
SIGMA: Letter on a frat house
OMEGA: Letter on a frat house, perhaps