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

Crossword clues for How gumshoes work:

SURREPTITIOUSLY: How gumshoes work
DETECT: Do gumshoe's work
DETECT: Do a gumshoe's work
CASES: Work for gumshoes
TAILING: Work for a gumshoe.