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

Crossword clues for Sources for 39 Across 5 letters:

OSCAR: With 70-Across, source of the quip at 21-, 39- and 58-Across
LODES: Sources for 39 Across
EWES: Sources of 39-Across