6c6,8
<      440000 ps:	a=0 b=1 e=1 f=1 -> sig1=1 sig2=1 -> y=0
---
>      400001 ps:	a=0 b=0 e=1 f=1 -> sig1=0 sig2=0 -> y=0
>      440000 ps:	a=0 b=1 e=1 f=1 -> sig1=1 sig2=0 -> y=1
>      444001 ps:	a=0 b=1 e=1 f=1 -> sig1=1 sig2=1 -> y=0
