bbbb bbbq bbdd bbdo bbpr bd-r bdii bibb bibi bibo bidi bido bidr bidu bio- bioi biou bipp bipu biqi birb bird biri biro birr biru bobb bobi bobo bobu bodb bodi bodo bodu boi- boid boii boiu boob bood boop boor bopp bor- bord bori boro borr boru boud boup bour bprd brdo brid brio briq brob brod broo bror brou brrr brud brup bubb bubi bubo bubq bubu budb budd budi budo budu buid buir buiu bur- burb burd buri buro burp burr buru d-bo dbpd dddd ddpo ddub dibb dibo dibp didi dido didu diii diop dior diou dipo dipp dipu diqo dird dirr dobb dobi dobu dod- dodd dodi dodo doid doob dood doop door dopo dopp dopr dord dori doro dorp dorr doru doub doud doup dour dqdb drib drip driq drob drod drop drou drub drui drup druu dub- dubb dubu dudd dudo dudu duid duir duo- dupo duqu duri duro duru duur ibdo ibid ibrd ibri ibro iddo idid idio idiq idir idro idub iduo iiii iiio iioi iioo iiop iobi iod- iodd iodo ioii ioio iooi iooo iori ipdi ipid ipod ipop ippo ippq ippr ipri ipur iqor irbp irdo irdp iri- irid irio irip irob irod irop irri iuiu iupp obbo obid oboi oboq obor obri obro odbo oddd oddi odio odir odiu odoo odop odor odou odrp odur oido oiii oobi oodi ooid oooo oord opii opio opo- opor oppi oppo opqr oqui orbb orbi orbo orbu ordo ordu ori- orid orio oro- oror orpi orri orro orub orup ouii ouir our- ouro ouu- pdpr pibb pibi pido piip piob pipi pipo pipp piri piro pirr piru pobo pod- podd podi podo podu poid poio pood poop poor pop- popi popo popp porb pori poro porr poud poui poup pour ppib ppid ppod pppd pppo pppp ppru ppur pri- prid prii pro- prob prod proo prop prou prpd prrd prri prud pruu pubu pudo pudu puid puir puiu pupi pupu pur- purb puri puro purp purr puru qdpr qdro qibo qiru qobu qoob qoop qpid qpod qppb qqqq qrio qubi qubo quib quid quip quir quob quod quoi quop quor qurd quri quro quu- rbbb rbbr rdbp rdio rib- ribo ribu ridd ridi rido riou ripd ripi ripp ripr riqq riri rob- robb robi robo robu rodd rodi rodo roid roio roir roiu roob rood rooi roop roor ropo rori roro roru roub roud roup rpdp rpii rpob rrrr rubb rubi rubp rubu rudd rudi rudo rudp ruid rupp rurd ruri ruro rurp ruru ruud u-rp ubbi ubbo ubid ubii ubir ubod ubud uddi udid udir udoo udop udpd uipi uirr uor- updo upor uppp uppu upri upup urbi urdu urib uriu uro- uroo urpo urri urup uruq urur uuri uuuu