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

Crossword clues for It can precede the starts of 20- and 58-Across and 11- and 29-Down:

FIRE: It precedes the starts of 20, 58-Across, 11, 29-Down
COLD: It can precede the starts of 20- and 58-Across and 11- and 29-Down