chapter6 ........\ex1.m ........\ex10.m ........\ex11.mdl ........\ex11sim.m ........\ex2.m ........\ex3.mdl ........\ex3sim.m ........\ex4.m ........\ex5.mdl ........\ex5sim.m ........\ex6.asv ........\ex6.m ........\ex7.m ........\ex8.mdl ........\ex8sim.m ........\ex9.m