new
push_front 3
push_front 7
assign
  pop_front 7
  size 1
  delete
exit
front 7
back 3
member 3 1
member 5 0
member 7 1
head
  retrieve 7
  next
  retrieve 3
  next0
exit
pop_front 7
head
  retrieve 3
  next0
exit
front 3
back 3
pop_front 3
size 0
empty 1
delete


new 
member 1 0
remove 2 0
size 0
push_front 3
push_front 2
push_front 1
size 3
member 1 1
member 2 1
member 3 1
remove 2 1
member 2 0
push_front 7
push_front 7
remove 7 1
member 7 1
pop_front 7 
remove 3 1
member 3 0
size 1
push_back 9
back 9
member 9 1
size 2
delete 
 

new 
pop_front!
push_front 1
pop_front 1
size 0
push_back 2
pop_front 2
size 0
delete


new 
head0 
tail0
size 0
push_front 4
size 1
head 
	retrieve 4
	next0 
	exit 
tail 
	retrieve 4 
	exit
push_front 3
size 2
head
	retrieve 3
	next 
	retrieve 4
	next0
	exit
tail 
	retrieve 4
	exit
push_front 2
size 3
head
	retrieve 2
	next 
	retrieve 3
	next
	retrieve 4
	next0
	exit
tail 
	retrieve 4
	exit
push_front 1
size 4
head
	retrieve 1
	next 
	retrieve 2
	next
	retrieve 3
	next 
	retrieve 4
	next0
	exit
tail 
	retrieve 4
	exit
push_back 5
size 5
head
	retrieve 1
	next 
	retrieve 2
	next
	retrieve 3
	next 
	retrieve 4
	next 
	retrieve 5
	next0
	exit
tail 
	retrieve 5
	exit
delete


new 
head0 
tail0
size 0

push_back 4
size 1
head 
	retrieve 4
	next0 
	exit 
tail 
	retrieve 4 
	exit
	
push_back 3
size 2
head
	retrieve 4
	next 
	retrieve 3
	next0
	exit
tail 
	retrieve 3
	exit
	
push_back 2
size 3
head
	retrieve 4
	next 
	retrieve 3
	next
	retrieve 2
	next0
	exit
tail 
	retrieve 2
	exit
	
push_back 1
size 4
head
	retrieve 4
	next 
	retrieve 3
	next
	retrieve 2
	next 
	retrieve 1
	next0
	exit
tail 
	retrieve 1
	exit
	
push_front 5
size 5
head
	retrieve 5
	next 
	retrieve 4
	next
	retrieve 3
	next 
	retrieve 2
	next 
	retrieve 1
	next0
	exit
tail 
	retrieve 1
	exit
front 5
back 1
member 5 1

assign
	size 5
	head
		retrieve 5
		next 
		retrieve 4
		next
		retrieve 3
		next 
		retrieve 2
		next 
		retrieve 1
		next0
		exit
	tail 
		retrieve 1
		exit
	front 5
	back 1
	member 5 1
	remove 4 1
	size 4
	delete
	exit
size 5

pop_front 5
size 4
head
	retrieve 4
	next 
	retrieve 3
	next
	retrieve 2
	next 
	retrieve 1
	next0
	exit
tail 
	retrieve 1
	exit
front 4
back 1
member 5 0

remove 3 1
remove 3 0
size 3
head 
	retrieve 4
	next 
	retrieve 2
	next 
	retrieve 1
	next0
	exit
tail
	retrieve 1
	exit
front 4
back 1

remove 1 1
size 2
head 
	retrieve 4
	next
	retrieve 2
	next0
	exit
tail
	retrieve 2
	exit
front 4
back 2

remove 4 1
remove 4 0
member 4 0 
size 1
head 
	retrieve 2
	next0
	exit
tail
	retrieve 2
	exit
front 2
back 2

pop_front 2
size 0
empty 1
head0
tail0

push_front 6
size 1
front 6
back 6

remove 6 1
size 0
head0
tail0
pop_front!
front!
back!

push_front 256
size 1
front 256
back 256

push_front 512
size 2
front 512
back 256

delete
details