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

Crossword clues for It's highly flammable:

TINDER: It's highly flammable
ETHERS: Highly flammable liquids
TINDER: Highly flammable wood
TINDERBOX: Highly flammable object
ETHER: Highly flammable solvent