X1=1; X2=0; X3=1 __ __ Y1=X1^X2 v X3 _ _ Y1=1^0 v 1 Y1=0^1 v 1 Y1=0 v 1 Y1=1 __________ Y2=X2^X3 v X1 _______ Y2=1^0 v 1 _____ Y2=0 v 1 _ Y2=1 Y2=0