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