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DB<125> @combis = glob("{a,a1}{b,b1}{c,c1}") => ("abc", "abc1", "ab1c", "ab1c1", "a1bc", "a1bc1", "a1b1c", "a1b1c1 +")
DB<129> $s = "aabc" => "aabc" ... AAbC AABc AABC