p a x0 p a b x1 x2 p a b a x2 p a a x1 x2 2.2 p a x0 p a b x1 x2 p a a x1 x2 p a x0 p a b x1 x2 p a b a x2 p a a x1 x2 true p a x0 p a b x1 x2 p a b a x2 p a a x1 x2 p a x0 p a b x1 x2 p a a x1 x2 true a 1 1 b 1 1 1 p 2 2 0 p 2 1 2 38 p a x0 p a b x1 x2 p a b a x2 p a a x1 x2 p a x0 p a b x1 x2 p a b a x2 p a a x1 x2 p a x0 p a b x1 x2 p a b a x2 p a a x1 x2 true a 1 1 b 1 2 1 p 2 1 1 2 p 2 2 2 1 b 1 1 0 p 2 1 0 2 0 0 p 2 1 0 2 0 0 p a x0 p a b x1 x2 p a b a x2 p a a x1 x2 NaTT certifiable-1.6