bbbb bbdd bbdo bbox bbpr bd-r bobb bobo bodb bodo boob bood boop boor boox bopp bor- bord boro borr bprd brdo brob brod broo bror brox brrr d-bo dbpd dddd ddpo do-x dobb dod- dodd dodo doob dood doop door dopo dopp dopr dord doro dorp dorr dppx drob drod drop dxbr dxdr dxrd dxrp dxrr dxrx dxxr dxxx obbo obor obox obro odbo oddd odoo odop odor odrp oooo oord opo- opor oppo orbb orbo ordo oro- oror orro oxo- oxox oxxo pdpr pobo pod- podd podo pood poop poor pop- popo popp porb poro porr ppod pppd pppo pppp pro- prob prod proo prop prox prpd prrd rbbb rbbr rdbp rob- robb robo rodd rodo roob rood roop roor roox ropo roro roxo rpdp rpob rrrr xbox xoro xorp xoxo xrdb xrod xxxo xxxx