bbbb bbdd bbdo bbpr bd-r bdii bfpo bfpp bibb bibi bibo bidi bido bidr biff bifi bio- bioi bipp birb bird biri biro birr bobb bobi bobo bodb bodi bodo bofd boff boi- boid boii boob bood boof boop boor bopp bor- bord borf bori boro borr bprd brdo brid brio brob brod broo bror brrr d-bo dbfo dbpd dbpf dddd ddpo dfrf dfri dibb dibo dibp didi dido dif- diff diii diop dior dipo dipp dird dirr dobb dobi dod- dodd dodi dodo doff doid doob dood doof doop door dopo dopp dopr dord dorf dori doro dorp dorr drib drif drip drob drod drof drop fbop ffff ffii ffrr fibp fidf fido fiff fifi fifo fiii fior fipp fofo foid food foof fopp for- forb ford fori foro forr fprf frib frid frio frip frob frop frpd ibdo ibfi ibid ibrd ibri ibro iddo idfp idid idio idir idrf idro ifbb ifid ifor ifpo ifrb ifrf ifri iiii iiio iioi iioo iiop iipf iobi iod- iodd iodo ioii ioio ioof iooi iooo iori ipdi ipid ipod ipop ippf ippo ippr ipri irbp irdo irdp iri- irid irio irip irob irod irop irri obbo obid oboi obor obri obro odbo oddd oddi odio odir odoo odop odor odrp ofdr off- offo offr ofid ofor oido oiii oobi oodi ooff ooid oooo oord opii opio opo- opor oppi oppo orbb orbi orbo ordo orff orfi ori- orid orif orio oro- orof oror orpi orri orro pbrf pdpr pfff pffr pibb pibi pido piff piip piob pipi pipo pipp piri piro pirr pobo pod- podd podi podo poff pofi poid poio pood poof poop poor pop- popi popo popp porb pori poro porr ppib ppid ppif ppod pppd pppo pppp pprf pri- prid prif prii pro- prob prod prof proo prop prpd prrd prri rbbb rbbr rdbp rdio rfdi rfid rib- ribo ridd ridi rido riff riif ripd ripi ripp ripr riri rob- robb robi robo rodd rodi rodo roff rofo roid roif roio roir roob rood roof rooi roop roor ropo rori roro rpdp rpii rpob rpof rrif rrrr