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

Crossword clues for Stamps, maybe 3 letters:

OKS: Stamps, maybe
OKD: Put a stamp on, maybe
APPROVES: Stamps, maybe
PENPALS: Exotic stamp collectors, maybe
REDATE: Stamp anew, maybe
ROOTED: Yelled and stamped one's feet, maybe