f x f f a a a f f a f a a x 2.2 f x f f a a a f a f a a f x f f a a a f f a f a a x true f x f f a a a f f a f a a x true a 0 40650 f 2 1 4 2 1 0 f 2 1 22250 2 22248 0 f x f f a a a f f a f a a x f x f f a a a f a f a a false NaTT certifiable-1.6