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