File list:
Two null placement
.................\33 55 null MC.fig
.................\33 55 null MC.jpg
.................\33 55 null MC1.jpg
.................\33 55 null MC2.fig
.................\33 55 Null.jpg
.................\33 55 Null.txt
.................\cof.m
.................\OA(27, 10, 3, 2).txt
.................\OAfexercise31.m
.................\OAgexercise31.m
.................\OApexercise31.m
.................\OAschebycheff2.m
.................\OAselect.m
