(3)混联：aHiH3X10X1HiH3X4X4X3X2H2H3H2X2OX4=H3X3=H3 (H,X,+ H2X2) = H,H3X, + H2H3X20 X3HiH20 X3H2HiX10X1X2H3HiH31X4X4第11页
第 11 页 （3）混联： X1 H1 X H2 2 H3 X3 X4 X4=H3X3=H3(H1X1+ H2X2)= H1H3X1 + H2H3X2 X1 X2 X4 H1H3 H2H3 X1 X2 X3 X4 H1 H2 H3 X1 X3 X4 H1H2 H1H3
(4)自环的消除：H,H3H41-H,X1 0X4H4HiX3X109X4X3HX2H21-H,X2H1H2X1X2X3YX3=H,X,+H2X2+ H3X31-H31-H3第12页
第 12 页 （4）自环的消除： X1 X2 X3 X4 H1 H2 H3 H4 X3=H1X1+H2X2+ H3X3 2 3 2 1 3 1 3 1 1 X H H X H H X X1 X2 X3 X4 H4 3 1 1 H H 3 2 1 H H