4a5,6
>      270001 ps:	a=0 b=0 e=0 f=1 -> sig1=0 sig2=0 -> y=0
>      314001 ps:	a=0 b=1 e=0 f=1 -> sig1=1 sig2=0 -> y=1
6a9,10
>      440001 ps:	a=0 b=0 e=1 f=1 -> sig1=0 sig2=1 -> y=1
>      484001 ps:	a=0 b=1 e=1 f=1 -> sig1=1 sig2=1 -> y=0
10a15,16
>      640001 ps:	a=0 b=0 e=1 f=1 -> sig1=0 sig2=1 -> y=1
>      684001 ps:	a=0 b=1 e=1 f=1 -> sig1=1 sig2=1 -> y=0
