bbbb bbdd bbdo bbox bd-r bdii bftt bibb bibi bibo bidi bido bidr bidx biff bifi bio- bioi biot biox birb bird biri biro birr birt birx bitd bito bitt bitx bixi bobb bobi bobo bodb bodi bodo bofd boff boi- boid boii boit boob bood boof boor boot boox bor- bord borf bori boro borr bort botb botd boti boto bott brdo brdt brid brio brit brix brob brod broo bror brot brox brrr btdt btob btor btrt bttb d-bo d-ix dbfo dbfx dbit dbtt dddd ddot dfdt dfrf dfri dftr dibb dibo didi dido dif- diff diii dior diot dird dirr dirt diti dito ditt dixi do-x dobb dobi dod- dodd dodi dodo doff doid doit doix doob dood doof door doot dord dorf dori doro dorr dort dotd doti doto dott drib drif drit drix drob drod drof drot dtor dtot dtox dttx dtxt dxbr dxbt dxdr dxfx dxif dxii dxix dxrd dxrf dxrr dxrt dxrx dxxr dxxx fdot fdti ffff ffii ffrr fftf fidf fido fiff fifi fifo fift fiii fior fiti fitt fixt fixx fobt fofo foid foix food foof foot for- forb ford fori foro forr fort foti foto fott foxx frib frid frio frit frob frot ftdi ftii fxdd ibdo ibfi ibid ibot ibox ibrd ibri ibro ibtb iddo idid idio idir idrf idro ifbb ifid ifit ifor ifrb ifrf ifri ifto iiii iiio iiit iioi iioo iitr iitt iobi iod- iodd iodo ioii ioio ioit ioof iooi iooo iori iotf ioto irdo iri- irid irio irix irob irod irri irtf irti itdo itif itof itoi itoo itor itrf itri ittf itto ixxi obbo obdt obid obit obix oboi obor obot obox obri obro obtd odbo oddd oddi odio odir odoo odor odot ofdr off- offo offr ofid ofit ofor oido oiii oirt oiti oobi oodi ooff ooid oooo oord oort ootb orbb orbi orbo ordo orff orfi ori- orid orif orio orit orix oro- orof oror orot orri orro orto otbd otif otit oto- otof otoo otor otro otti otto oxi- oxid oxo- oxof oxox oxxo rbbb rbbr rdio rfdi rfid rib- ribo ridd ridi rido ridx riff rift riif riot riri riti rito ritt rixo rob- robb robi robo robt rodd rodi rodo roff rofo roid roif roio roir roit roob rood roof rooi roor root roox rori roro rort roti roto rotr rott roxo rrif rrrr rtbf rtdt rtfb tbit tbox tbrb tddb tdff tdor tdri tfot tfox tibi tidd tiff tifo tift tiit tirb tird tiri tiro tirr titi tito titt tixt tobi tobo tobt todd todi todo todt toff tofi tofo toft toid toit tood toof toor toot tord torf tori toro torr tort torx totd toti toto totr tott tox- toxi toxo toxt trfd trfr tri- trib trif trio trit trix trod troi troo trot trox trtr ttbb ttff tttt txii txtr x-fi xbox xdxf xibo xidi xiii xito xixi xoro xoxo xrdb xrod xtro xxii xxix xxxi xxxo xxxx