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

Crossword clues for French-Belgian river:

OISE: French-Belgian river.
LYS: French-Belgian river
YSER: French-Belgian river
LYS: French-Belgian boundary river
LYS: French-Belgian border river
LYS: River on French-Belgian boundary
LYS: River, part of French-Belgian boundary.