CHAPTER4\CHAP4_1.M ........\CHAP4_2.M ........\CHAP4_3.M ........\CHAP4_4.M ........\CHAP4_5.M ........\CHAP4_6.M ........\CHAP4_7.MDL ........\chap4_7f1.m ........\chap4_7f2.m CHAPTER4