5	rebar	5	barre
5	barer	4	rear
4	rare	4	brer
4	brae	4	bear
4	bare	4	arre
3	reb	3	rea
3	err	3	era
3	ear	3	brr
3	bra	3	bar
3	bae	3	are
3	arb	2	re
2	er	2	be
2	ba	2	ar
2	ae	2	ab