A 1
A 2
A 5 
A 7
l
value=7
value=5
value=2
value=1
p
No current node.
h
p
value=7
n
p
value=5
n
p
value=2
n
p
value=1
n
p
No current node.
h
p
value=7
n
p
value=5
q
value=2
d
q
value=1
l
value=7
value=5
value=1
D
l
value=5
value=1
p
value=5