a a a x1 a b b x1 b a b x1 a b a x1 2.2 b a b x1 b a x1 a a a x1 b x1 a a a x1 b b x1 b a b x1 a x1 b a b x1 a b a x1 a a a x1 a b b x1 true a a a x1 a b b x1 b a b x1 a b a x1 b a b x1 a x1 a a a x1 b x1 a a a x1 b b x1 b a b x1 b a x1 true a 1 1 7721 b 1 1 7721 a 1 1 0 b 1 1 1 a a a x1 a b b x1 a a a x1 a b b x1 b a b x1 a b a x1 a a a x1 a b b x1 true Failed! NaTT certifiable-1.6