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

Crossword clues for Jack's preceder:

IKE: He preceded Jack
TENSPOT: Jack preceder
FLAP: Jack preceder
IKE: He preceded Jack as president
IKE: Jack preceder
PAAR: Jack who preceded Carson
PAAR: Jack who preceded Carson on late-night TV
IKE: Jack's preceder