f f a f g n__f n__a f X n__f X a n__a activate n__f X f activate X activate n__a a activate X X 2.2 f f a f g n__f n__a activate n__f X f activate X activate n__a a activate n__f X activate X true activate n__f X activate X true a 0 0 n__a 0 0 activate 1 0 activate 1 1 0 f 1 0 n__f 1 1 1 f 1 0 a 0 0 g 1 0 activate n__a a false activate n__f X f activate X false f f a f g n__f n__a false NaTT certifiable-1.6