new
empty 1
size 0
head0
push_front 13.5
empty 0
size 1
head
	retrieve 13.5
	next
	retrieve 13.5
exit
push_front 14.5
empty 0
size 2
head
	retrieve 14.5
	next
	retrieve 13.5
	next
	retrieve 14.5
exit
push_front 15.5
empty 0
size 3
head
	retrieve 15.5
	next
	retrieve 14.5
	next
	retrieve 13.5
	next
	retrieve 15.5
exit
push_front 16.5
empty 0
size 4
head
	retrieve 16.5
	next
	retrieve 15.5
	next
	retrieve 14.5
	next
	retrieve 13.5
	next
	retrieve 16.5
exit
push_back 12.5
empty 0
size 5
head
	retrieve 16.5
	next
	retrieve 15.5
	next
	retrieve 14.5
	next
	retrieve 13.5
	next
	retrieve 12.5
	next
	retrieve 16.5
exit
pop_front 16.5
empty 0
size 4
head
	retrieve 15.5
	next
	retrieve 14.5
	next
	retrieve 13.5
	next
	retrieve 12.5
	next
	retrieve 15.5
exit
pop_back 12.5
empty 0
size 3
head
	retrieve 15.5
	next
	retrieve 14.5
	next
	retrieve 13.5
	next
	retrieve 15.5
exit
pop_front 15.5
pop_back 13.5
pop_front 14.5
empty 1
size 0
head0
delete
summary
exit