f f a x a f f f a a f x a a 2.2 f f a x a f f a a f x a f f a x a f a a f f a x a f f f a a f x a a f f a x a f x a true f f a x a f x a f f a x a f f f a a f x a a f f a x a f f a a f x a true a 0 2 f 2 1 f 2 2 0 f f a x a f f f a a f x a a f f a x a f x a f f a x a f f f a a f x a a f f a x a f x a f f a x a f f f a a f x a a true 2 1 a 0 0 12063 f 2 0 0 1 0 1 1 0 1 0 2 0 0 f 2 1 1 0 0 1 0 0 f f a x a f f f a a f x a a f f a x a f f f a a f x a a f f a x a f f f a a f x a a true 2 1 a 0 1 2 f 2 0 0 1 0 1 15329 1 f 2 1 0 0 0 1 0 0 f f a x a f f f a a f x a a f f a x a f a a false NaTT certifiable-1.6