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

Crossword clues for Climbers' rests:

LEDGES: Climbers' rests
LEDGE: Climber's rest stop
LEDGE: Rock climber's resting place
LEDGE: Climber's rest stop, maybe
LEDGE: Rest stop for a rock climber