B \(ab*\)\{1,9\}\1 abbbabbabbbbb (0,10)(4,7) B \(ab\(xyz\)*\)\(c\(d\)*\)\{0,3\} abcdcdc (0,7)(0,2)(?,?)(6,7)(?,?) B \(^a\)\1 aabc (0,2)(0,1)