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

Crossword clues for Be extremely successful:

HUGE: Extremely successful
BOFFO: Extremely successful
SOCKO: Extremely successful, slangily
SOCKO: Extremely successful, in slang
GOGREATGUNS: Be extremely successful
BOFFO: Extremely successful, in theater lingo