new
push_front 3
push_front 4
push_front 5
push_front 6
move
	front 6
	pop_front
	front 5
	pop_front 
	front 4
	delete
exit
assign
	front 6
	pop_front
	front 5
	pop_front 
	front 4
	delete
exit
front 6
delete
summary