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

Crossword clues for Extremely simple 10 letters:

IDIOTPROOF: Extremely simple
ONESTEP: Like extremely simple instructions
EASYASPIE: Extremely simple
MINIMALISTART: Extremely simple visual style
STARK: Extremely simple
ONESTEP: Simple in the extreme