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la semaine des quatre jeudis (the week with four thursdays) betyder på engelska

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la semaine des quatre jeudis (the week with four Thursdays) adverbe

when pigs fly(never, expressed by an idiom)
adverb
[UK: wen pɪɡz flaɪ] [US: hwen ˈpɪɡz ˈflaɪ]