Find Symptom Using Unit Propagation A=1 true 0=C A=1 (F=1)y-(F=0) (O1=G)v-(A=1)vX-1+X=1 true F=1 F=1 AIG+(Al=G)V(X-1)V=(Y=I)VF=1 F=l (02=G)-(B=1)Y=1+y=1 true 02=G B=1 10/03/03 copyright Brian Williams, 200310/03/03 copyright Brian Williams, 2003 8 Find Symptom Using Unit Propagation (O1=G) (A=1) X=1 (A1=G) (X=1) (Y=1) F=1 (O2=G) (B=1) Y=1 (F=1) (F=0) B=1 O1=G B=1 true O2=G A=1 A=1 true X=1 Y=1 A1=G F=1 F=1 F=1 true