b a c b b x1 a c b b b a c x1 2.2 b a c b b x1 b b a c x1 b a c b b x1 b a c x1 b a c b b x1 b b b a c x1 true b a c b b x1 b b b a c x1 b a c b b x1 b a c x1 b a c b b x1 b b a c x1 true a 1 1 0 b 1 1 8366 c 1 1 0 b 1 1 0 b a c b b x1 b b b a c x1 b a c b b x1 a c b b b a c x1 b a c b b x1 b b b a c x1 true Failed! NaTT certifiable-1.6