bbbb bbdd bbdo bbox bd-r bdii bibb bibi bibo bidi bido bidr bidx bio- bioi biox birb bird biri biro birr birx bixi bobb bobi bobo bodb bodi bodo boi- boid boii boob bood boor boox bor- bord bori boro borr brdo brid brio brix brob brod broo bror brox brrr d-bo d-ix dddd dibb dibo didi dido diii dior dird dirr dixi do-x dobb dobi dod- dodd dodi dodo doid doix doob dood door dord dori doro dorr drib drix drob drod dxbr dxdr dxii dxix dxrd dxrr dxrx dxxr dxxx ibdo ibid ibox ibrd ibri ibro iddo idid idio idir idro iiii iiio iioi iioo iobi iod- iodd iodo ioii ioio iooi iooo iori irdo iri- irid irio irix irob irod irri ixxi obbo obid obix oboi obor obox obri obro odbo oddd oddi odio odir odoo odor oido oiii oobi oodi ooid oooo oord orbb orbi orbo ordo ori- orid orio orix oro- oror orri orro oxi- oxid oxo- oxox oxxo rbbb rbbr rdio rib- ribo ridd ridi rido ridx riri rixo rob- robb robi robo rodd rodi rodo roid roio roir roob rood rooi roor roox rori roro roxo rrrr xbox xibo xidi xiii xixi xoro xoxo xrdb xrod xxii xxix xxxi xxxo xxxx