new
insert 3.1
insert 5.1
insert 9.1
insert 2.1
insert 4.1
size 5
root
retrieve 0 2.1
retrieve 1 3.1
retrieve 2 4.1
retrieve 3 5.1
retrieve 4 9.1
exit
insert 7.1
root
	subtree 0
		retrieve 0 2.1
		retrieve 1 3.1
		retrieve 2 4.1
	exit
	subtree 1
		retrieve 0 5.1
		retrieve 1 7.1
		retrieve 2 9.1
	exit
exit
delete
summary