7	ribbier	6	ribier
6	ribbie	6	ribber
6	briber	5	brier
5	bribe	4	irie
4	brie	4	brer
4	birr	4	biri
4	bier	4	bibi
3	rib	3	reb
3	ire	3	err
3	ebb	3	brr
3	bib	2	re
2	er	2	bi
2	be