bbbb bbch bbci bbeb bbfc bbox bcbc bccc bcci bcec bcfc bche bcie bcof bebb bebe bebi bebo bech beci beeb beef befe beff befo beic beo- beof bhcc bhff bhie bhoi bibb bibe bibi bibo bicc bice bich bici bico bieb bief biff bifi bihe bihi bio- bioc bioi biox bixi bobb bobe bobi bobo boce boch boco boec boee boef boeo bofe boff bofh boho boi- boie boii boob booc booe boof booh boox c-bo cbbc cbcc cbce cbec cbee cbef cbfb cbfc cbox ccbc cccb cccc cccf ccci ccee ccfc ccff ccfi cche ccic ccii ccix ccob ccoc ccxi cec- cece ceci ceco ceeb ceec cef- cefc cexe cfbc cfcb cfcf cfco cffb cfix cfox chce chch chci cheb chec chee chef cheh chex chfc chfi chib chic chie chif chih choc choh choi choo cibc cibe cibi cibo cicc cich cici cico ciee cife ciff ciii ciob cixi cobb cobe cobh cobi cobo coce coch coco coex cofc cofe coff cofi coho coif coix coob coof cooh coxe cxii cxix cxxi cxxx ebbc ebbo ebcc ebfc ebic ebix eboe eboo ebox ecbc ecbe eccb eccc ecce ecci ecco ecef ecfc eche echo ecib eco- eeee eefe eeoc efco efeo effi efic ehcc eheh eich eico eiec eiei eiho exch exco exec exfo exh- exhi exif exo- fccf fcch fcic fcii febo fece fech feeb fefc fefe feff fefi fefo feie feio feof feoh ffcc ffee ffff ffii fhci fibe ficc fice fich fico fiec fief fifc fife fiff fifi fifo fiii fioe fixe fixx foce foch foci foco fofo foie foix foof foxe foxh foxx h-ii hbfc hbic hbio hboc hbox hcbc hccb hccc hcch hcfc hchi hebb hebe hebi hebo hech heeb heef hefe hehe heho heic heie heif heih hex- hexb hexe hexi hfce hhex hhhh hhof hi-c hibi hicc hice hich hico hiei hiff hifh hifi hifo hifx hihc hihe hihi hiho hiie hiob hioc hobe hobo hoce hoch hoei hofe hoff hofx hohe hoho hoie hoif hoix hooe hoof hoox i-be ibec ibeh ibex ibfi ibie ibox icbc iccb iccc iccf icci icco icec icee icef icex icfb ichc iche ichi icho icoc iecc ieie ieio ieoh ifbb ifco ifex ifhe ific ihcc ihob iiie iiii iiio iioi iioo iobi ioci ioee iofc ioii ioio ioof iooi iooo ixxi o-eo obbo obec obex obie obix oboe oboi obox ocbc occc occi oce ocee ocef oche ochi oec- oecc oeec off- offc offe offh offo ohbe ohcc ohee ohhi ohho ohif ohio ohob ohoh oici oiii oobe oobi ooff ooho oooh oooo oxi- oxic oxie oxo- oxof oxox oxxo x-fi xbee xbox xcii xefe xexe xfce xhoi xibe xibo xico xihe xiii xixi xobc xoco xoxo xxii xxix xxxi xxxo xxxx