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

Crossword clues for Hard nut to crack.:

PECAN: Hard nut to crack
EASYJOB: Not a hard nut to crack
POSER: Hard nut to crack.
ENIGMA: Hard nut to crack
ENIGMAS: Hard nuts to crack
ACORN: Hard nut to crack?