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

Crossword clues for Can., U.S., Mex., etc. 4 letters:

AMER: Mex., U.S., etc.
AMER: Can., U.S., Mex., etc.
OAS: Group comprising U.S., Mex., etc.