bbbb bbdd bbdo bbpr bd-r bobb bobo bodb bodo boob bood boop boor boot bopp bor- bord boro borr bort botb botd boto bott bpot bprd brdo brdt brob brod broo bror brot brrr btbp btdt btob btor btrt bttb d-bo dbpd dbtt dddd ddot ddpo dobb dod- dodd dodo doob dood doop door doot dopo dopp dopr dopt dord doro dorp dorr dort dotd doto dott dpdt drob drod drop drot dtdp dtor dtot dttp obbo obdt obor obot obro obtd odbo oddd odoo odop odor odot odrp oooo oord oort ootb ootp opo- opor oppo opto orbb orbo ordo oro- oror orot orro orto otbd oto- otoo otor otpp otro otto pdpr pobo pod- podd podo pood poop poor poot pop- popo popp popt porb poro porr port potd poto pott ppod pppd pppo pppp pptt pro- prob prod proo prop prot prpd prrd prtp prtr ptop ptpd ptrd rbbb rbbr rdbp rob- robb robo robt rodd rodo roob rood roop roor root ropo roro rort roto rotr rott rpdp rpob rptd rrrr rtdt rttp tbrb tbtp tddb tdor tobo tobt todd todo todt tood toor toot top- topd topo topp topt tord toro torp torr tort totd toto totr tott tppd tppp tppr tptp tptr trod troo trop trot trpp trtr ttbb ttop tttt