2a3,4
>       90001 ps:	a=0 b=0 e=0 f=0 -> sig1=0 sig2=1 -> y=1
>      134001 ps:	a=1 b=0 e=0 f=0 -> sig1=1 sig2=1 -> y=0
8a11,12
>      560001 ps:	a=0 b=0 e=1 f=1 -> sig1=0 sig2=1 -> y=1
>      604001 ps:	a=1 b=0 e=1 f=1 -> sig1=1 sig2=1 -> y=0
