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

Crossword clues for Arduous task:

SLOGS: Arduous tasks
ONUS: Arduous task
GRIND: Arduous task
ITLLTAKEFOREVER: Hyperbole for an arduous task
SLOG: Arduous task
TRAVAIL: Arduous task