b a b a b b x1 a b b a b b a x1 2.2 b a b a b b x1 b a b b a x1 b a b a b b x1 b b a x1 b a b a b b x1 b b a b b a x1 b a b a b b x1 b a x1 true b a b a b b x1 b a x1 b a b a b b x1 b b a b b a x1 b a b a b b x1 b b a x1 b a b a b b x1 b a b b a x1 true a 1 1 0 b 1 1 21239 b 1 1 0 b a b a b b x1 b b a b b a x1 b a b a b b x1 a b b a b b a x1 b a b a b b x1 b b a b b a x1 true 2 1 a 1 0 0 1 1 1 1 0 b 1 0 1 1 0 1 0 0 b 1 1 0 1 1 1 0 0 b a b a b b x1 a b b a b b a x1 NaTT certifiable-1.6