a a x1 a b x1 a c x1 b x1 b b x1 c b a x1 2.2 b b x1 b a x1 a a x1 b x1 b b x1 a x1 a c x1 b x1 a a x1 a b x1 true a a x1 a b x1 a c x1 b x1 b b x1 a x1 a a x1 b x1 b b x1 b a x1 true a 1 1 7721 b 1 1 7721 c 1 1 0 a 1 1 1 b 1 1 0 b b x1 b a x1 a a x1 a b x1 a a x1 a b x1 b b x1 c b a x1 a c x1 b x1 a a x1 a b x1 true a 1 1 2 b 1 1 c 1 0 a 1 1 1 b 1 1 0 a a x1 a b x1 b b x1 c b a x1 a c x1 b x1 b b x1 b a x1 true Failed! NaTT certifiable-1.6