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

Crossword clues for Sagan or Sandburg 4 letters:

CARL: Sagan or Sandburg
CARL: Sandburg or Sagan
CARLS: Sandburg and Sagan
CARLS: Sagan and Sandburg
CARLS: Sandburg and Sagan, for two