7	privier	5	viper
5	river	5	riper
5	prier	5	pirri
4	vier	4	rive
4	ripe	4	pier
4	perv	4	peri
4	irie	3	vip
3	vie	3	rip
3	rev	3	rep
3	pre	3	pir
3	pie	3	per
3	ire	3	err
2	re	2	pi
2	pe	2	er