new file:   copied.txt
 	new file:   ex10.py
 	new file:   ex11.py
 	new file:   ex13.py
 	new file:   ex14.py
 	new file:   ex15.py
 	new file:   ex15_sample.txt
 	new file:   ex16.py
 	new file:   ex17.py
 	new file:   ex18.py
 	new file:   ex19.py
 	new file:   ex20.py
 	new file:   ex21.py
 	new file:   ex22.py
 	new file:   ex25.py
 	new file:   ex25.pyc
 	new file:   ex26.py
 	new file:   ex3.py
 	new file:   ex4.py
 	new file:   ex4a1.py
 	new file:   ex5.py
 	new file:   ex6.py
 	new file:   r.py
 	new file:   test.txt