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variants {"hello"; "hello" ++ "hello"} variants {"a" ++ "a"; "b" ++ "b"} variants {"a"; "b"} "c" variants {"a"; "b"} ++ variants {"a"; "b"} variants {"a"; "b"} "c" variants {"a"; "b"} ++ variants {"a"; "b"} variants {"a"; "b"} "c" ++ "c" "c"