bbbb bbdd bbdo bbpr bd-r bdii bibb bibi bibo bidi bido bidr bio- bioi biot bipp birb bird biri biro birr birt bitd bito bitt bobb bobi bobo bodb bodi bodo boi- boid boii boit boob bood boop boor boot bopp bor- bord bori boro borr bort botb botd boti boto bott bpot bprd bpti brdo brdt brid brio brit brob brod broo bror brot brrr btbp btdt btob btor btrt bttb d-bo dbit dbpd dbtt dddd ddot ddpo dibb dibo dibp didi dido diii diop dior diot dipo dipp dipt dird dirr dirt diti dito ditt dobb dobi dod- dodd dodi dodo doid doit doob dood doop door doot dopo dopp dopr dopt dord dori doro dorp dorr dort dotd doti doto dott dpdt drib drip drit drob drod drop drot dtdp dtor dtot dttp ibdo ibid ibot ibrd ibri ibro ibtb iddo idid idio idir idro idtp iiii iiio iiit iioi iioo iiop iitr iitt iobi iod- iodd iodo ioii ioio ioit iooi iooo iori ioto ipdi ipid ipod ipop ippo ippr ipri ipto irbp irdo irdp iri- irid irio irip irob irod irop irri irti irtp itdo itoi itoo itor itri itto obbo obdt obid obit oboi obor obot obri obro obtd odbo oddd oddi odio odir odoo odop odor odot odrp oido oiii oirt oiti oobi oodi ooid oooo oord oort ootb ootp opii opio opit opo- opor oppi oppo opti opto orbb orbi orbo ordo ori- orid orio orit oro- oror orot orpi orri orro orto otbd otit oto- otoo otor otpp otro otti otto pdpr pibb pibi pido piip piob piot pipi pipo pipp piri piro pirr piti pito pitr pitt pobo pod- podd podi podo poid poio pood poop poor poot pop- popi popo popp popt porb pori poro porr port potd poti poto pott ppib ppid ppod pppd pppo pppp pptt pri- prid prii pro- prob prod proo prop prot prpd prrd prri prti prtp prtr ptop ptpd ptrd rbbb rbbr rdbp rdio rib- ribo ridd ridi rido riot ripd ripi ripp ripr ript riri riti rito ritt rob- robb robi robo robt rodd rodi rodo roid roio roir roit roob rood rooi roop roor root ropo rori roro rort roti roto rotr rott rpdp rpii rpob rptd rrrr rtdt rttp tbit tbrb tbtp tddb tdor tdri tibi tidd tiit tiop tip- tipi tipo tipp tipt tirb tird tiri tiro tirr titi tito titp titt tobi tobo tobt todd todi todo todt toid toit tood toor toot top- topd topi topo topp topt tord tori toro torp torr tort totd toti toto totr tott tpir tppd tppp tppr tptp tptr tri- trib trio trip trit trod troi troo trop trot trpp trtr ttbb ttop tttt