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

Crossword clues for Gehrig and Costello:

LOU: Costello or Gehrig
LOUS: Gehrig and Costello
LOSE: Costello and Gehrig*
LOU: Gehrig or Costello
LOUS: Costello and Gehrig