6	herder	5	heder
5	erred	4	reed
4	rede	4	here
4	herd	4	heed
4	dree	4	dere
4	deer	3	ree
3	red	3	her
3	hed	3	err
3	ere	3	edh
3	der	3	dee
2	re	2	he
2	er	2	eh
2	ee	2	ed
2	de