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

Crossword clues for Arthur's foster brother 3 letters:

KAY: Arthur's foster brother
KAY: King Arthur's foster brother
KAY: Foster brother of King Arthur.
KAY: Sir ___, foster brother of King Arthur
SIRKAY: King Arthur's foster brother
KAYS: King Arthur's foster brother et al.
SIRKAY: Arthur's foster brother