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

Crossword clues for Did thorough research:

VET: Research thoroughly
DIGDEEP: Research thoroughly
BEHINDTHESCENES: Look __ (research thoroughly)
DIG: Do thorough research
DELVED: Researched thoroughly
DELVED: Did thorough research
DELVES: With 77-Down, does thorough research on