p 0 0 p s X X leq 0 Y true leq s X 0 false leq s X s Y leq X Y if true X Y activate X if false X Y activate Y diff X Y if leq X Y n__0 n__s diff p X Y 0 n__0 s X n__s X activate n__0 0 activate n__s X s X activate X X 2.2 activate n__0 0 diff X Y if leq X Y n__0 n__s diff p X Y diff X Y p X diff X Y leq X Y leq s X s Y leq X Y activate n__s X s X if true X Y activate X diff X Y diff p X Y if false X Y activate Y true diff X Y diff p X Y true Failed! NaTT certifiable-1.6