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

Crossword clues for Pos. and neg.:

OPP: Pos., to neg.
OPP: Neg., to pos.
OPPS: Pos. and neg.
NOS: They may be pos. or neg.
NEUT: Neither neg. nor pos.
OPPS: Pos. and neg., e.g.
OPP: Pos., vis- -vis neg.