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

Crossword clues for Cockney's 50%:

ALF: Cockney's 50%
ARF: Cockney's 50 per cent
EAST: With 50-Across, home for Cockneys
ECK: 50-Down's place, in a Cockney accent