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

Crossword clues for Year in school: Abbr. 4 letters:

SOPH: Year in school: Abbr.
SEM: Part of a school year: Abbr.
SEM: Half a school year: Abbr.
SRS: End-of-school-year pranksters (Abbr.)