4a5,6
>      270001 ps:	a=0 b=1 e=0 f=1 -> sig1=1 sig2=0 -> y=0
>      314001 ps:	a=0 b=1 e=0 f=1 -> sig1=1 sig2=0 -> y=1
7a10,11
>      500001 ps:	a=0 b=0 e=1 f=1 -> sig1=0 sig2=1 -> y=0
>      544001 ps:	a=0 b=0 e=1 f=1 -> sig1=0 sig2=1 -> y=1
9a14
>      610001 ps:	a=0 b=0 e=1 f=1 -> sig1=0 sig2=1 -> y=0
