f f a a x f f a x f a f a a 2.2 f f a a x f a x f f a a x f a f a a f f a a x f f a x f a f a a true f f a a x f f a x f a f a a true 2 1 a 0 1 12060 f 2 1 0 0 0 1 0 0 1 0 2 27690 12059 f 2 1 0 0 0 1 0 0 1 0 2 0 0 f f a a x f f a x f a f a a f f a a x f a f a a false f f a a x f a x false NaTT certifiable-1.6