active f f a mark f g f a mark f X active f X mark a active a mark g X active g mark X f mark X f X f active X f X g mark X g X g active X g X 2.2 f active X f X active f f a mark f g f a g active X g X mark g X g mark X mark g X mark X active f f a f g f a mark g X active g mark X mark a active a g mark X g X mark f X active f X active f f a g f a f mark X f X true mark g X mark X true a 0 0 f 1 0 mark 1 1 0 mark 1 0 f 1 0 g 1 0 active 1 0 active 1 0 g 1 1 1 mark g X g mark X false g mark X g X g active X g X true a 0 0 f 1 0 mark 1 0 mark 1 1 1 f 1 0 g 1 1 0 active 1 1 1 active 1 0 g 1 1 mark a active a false mark g X active g mark X false mark f X active f X active f f a mark f g f a true a 0 1 f 1 1 1425 mark 1 1 1 mark 1 1 1 f 1 0 g 1 0 active 1 1 1 active 1 1 0 g 1 1424 g active X g X f mark X f X g mark X g X f active X f X active f f a g f a false active f f a f g f a false f mark X f X f active X f X true a 0 1 f 1 1 1425 mark 1 1 1 mark 1 1 1 f 1 1 0 g 1 0 active 1 1 1 active 1 1 0 g 1 1424 g active X g X f mark X f X g mark X g X f active X f X NaTT certifiable-1.6