a a b a b a b a b x1 a b a b a b a b a a a a a b x1 2.2 a a b a b a b a b x1 a b a b a b a a a a a b x1 a a b a b a b a b x1 a a a a b x1 a a b a b a b a b x1 a a a b x1 a a b a b a b a b x1 a a a a a b x1 a a b a b a b a b x1 a b a b a a a a a b x1 a a b a b a b a b x1 a b a b a b a b a a a a a b x1 a a b a b a b a b x1 a a b x1 a a b a b a b a b x1 a b a a a a a b x1 true a a b a b a b a b x1 a a b x1 a a b a b a b a b x1 a a a a b x1 a a b a b a b a b x1 a a a a a b x1 a a b a b a b a b x1 a a a b x1 true Failed! NaTT certifiable-1.6