5	urban	5	unbar
5	buran	4	burn
4	bura	4	buna
4	bran	4	barn
3	urn	3	urb
3	uan	3	run
3	rub	3	ran
3	nub	3	nab
3	bur	3	bun
3	bra	3	bar
3	ban	3	arb
2	un	2	nu
2	na	2	ba
2	ar	2	an
2	ab