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

Crossword clues for Pioneer in science fiction 12 letters:

MERCURYWELLS: Pioneer in science fiction
VERNE: Science fiction pioneer
HUGO: Science fiction pioneer Gernsback
VERNE: Science fiction pioneer Jules
VERNE: Pioneer of science fiction.
VERNE: Jules who pioneered in science fiction