b-u bbb bbd bbf bbo bbr bbs bbu bdb bdd bdf bdo bdr bds bdu bfb bfd bff bfo bfr bfs bfu bob bod bof boo bor bos bou brb brd brf bro brr brs bru bsb bsd bsf bso bsr bss bsu bub bud buf buo bur bus buu dbb dbd dbf dbo dbr dbs dbu ddb ddd ddf ddo ddr dds ddu dfb dfd dff dfo dfr dfs dfu dob dod dof doo dor dos dou drb drd dro drr drs dru dsb dsd dsf dso dsr dss dsu dub dud duf duo dur dus fbb fbd fbf fbo fbr fbs fbu fdb fdd fdf fdo fdr fds fdu ffd fff ffo ffr ffs ffu fob fof foo for fos fou frb frd frf fro frr frs fru fsb fsd fsf fso fsr fss fsu fub fud fuf fuo fur fus fuu ob- obb obd obf obo obr obs obu odb odd odf odo odr ods odu of- ofb ofd off ofo ofr ofs ofu oo- oob ood oof ooo oor oos or- orb ord orf oro orr ors oru os- osb osd osf oso osr oss osu ou- oud ouf ouo our ous rbb rbd rbf rbo rbr rbs rbu rdb rdd rdf rdo rdr rds rdu rfb rfd rff rfo rfr rfs rfu rob rod rof roo ror ros rou rrb rrd rrf rrr rrs rru rsb rsd rsf rso rsr rss rsu rub rud ruf ruo rur rus ruu sbb sbd sbf sbo sbr sbs sbu sdb sdd sdf sdo sdr sds sdu sfb sfd sff sfo sfr sfs sfu sob sod sof soo sor sos sou sr- srb srd srf sro srr srs ss- ssb ssd ssf sso ssr sss ssu sub sud suf suo sur sus suu ubb ubf ubo ubr ubs ubu udb udd udf udo udr uds udu ufd uff ufo ufr ufs ufu uob uod uoo uor uos ur- urb urd urf uro urr urs uru usb usd usf uso usr uss usu uur uus uuu

-ous bbbb bbbs bbdd bbdo bd-r bdos bdsd bduf bffs bfsr bobb bobo bobs bobu bodb bodo bods bodu bofd boff bofs bofu boob bood boof boor boos bor- bord borf boro borr bors boru boso boss bosu boud bouf bour bous brdo brds brfu brob brod broo bror bros brou brrr brrs brsb brsr brud brus bsbd bsff bsfs bsod bsos bsrd bssd bubb bubo bubs bubu budb budd budo buds budu buff bufo bufr bur- burb burd buro burr burs buru buss busu buus d-bo dbfo dbfs dbos dbrs dbss dbus dddd ddss ddub dfds dfrf dobb dobs dobu dod- dodd dodo dods doff doob dood doof door doos dord dorf doro dorr dors doru doso doss doub doud douf dour dous drob drod drof drou drrs drub drus druu dsdr dsos dsrr dub- dubb dubs dubu dudd dudo duds dudu duff dufu duo- duos duro duru duur fbrs fbsd fbus fdos ffff ffrr ffss fobs fofo food foof foos for- forb ford foro forr fors fosb foso foss foud four fous frob fros frou frsb frso frub fsfo fssf fubb fubs fubu fudd fuff fufu fuor fur- furo furr furs fusd fuso fuss fusu obbo obor obos obro obsd obsr obss obus odbo oddd odds odoo odor odos odou odso odur odus ofdr off- offo offr offs offu ofor ofus ooff oofs oooo ooos oord oous orbb orbo orbs orbu ordo ords ordu orff orfs orfu oro- orof oror oros orro orrs orso orsu orub orus osoo osor osos osrd osro ossb ossd osso ossu oubs ouds ouff our- ouro ours ousd ouu- rbbb rbbr rbbs rbds rbsd rbss rdos rdso rfds rob- robb robo robs robu rodd rodo rods roff rofo roob rood roof roor roos roro roru roso ross roub roud rouf rous rrrr rsdd rsds rsos rubb rubs rubu rudd rudo ruds ruff rufo rurd ruro rurs ruru ruso russ rusu ruud s-os sbbs sbds sbor sbsd sbus sdds sdrs sdsf sdss sdsu sfor sfos sfro sfss sfsu sobo sobr sobs sobu sodd sodo sods sodu sofo sood soof soor soos sorb sord soro sorr sors soru soso soss soud souf sour sous sros srsd srub ssbr ssdd ssdf ssrs sssb sssf ssss sub- subb subd subo subs sudd sudo suds suf- suff sufr sufs sufu suor suos sur- surd surf suro surr surs suru sus- susd suso suss susu suus ubbo ubod ubos ubud udds udoo udos udsd ufos uofo uor- urbs urds urdu urff uro- uroo urso urss ursu urur urus usbr usbs usdf usdo usds usfs usos ussb ussf ussr usss ussu usus uuuu

bbuss bdoor bdubs bo-bo bobos bobr bodd- bodor bodos boffo boffs boobs boofs boord boors booru borbo bordo bords boro- borod boroo boros borou borro borsu borus bosor bosso boudu bourd bours brobo brobs brodd brodo brood broos bross broud brous brrrr brud- bruds bruff bruss bsous budds buddu budos budur buffo buffs bufos buord burbs burds buroo buros burro burrs burru burud burus busso bussu busur busuu d-bus d-rod dbdos ddddd do-do dobbs dobos dobro dodds dodoo dodos dodro doffs dofor dofus doobs doodo doods doofs doors dorff doros dorrs dors- dorso dorud dorus dosso dosur doubs douds doufu douro dours drbob drdos drobo droff drood droof dross drubs dubbo dubbs dubos dubus duddo dudou duffs dufur dufus duros fodor fofos foodb foods foord forbs ford- fordo fords foros forro forso forss forud forur forus fouds fourb fourd fouro fours frobs frodo frood froud fu-fu fubbs fubus fudds fuddu fuffs furbo furo- furor furrs furud furus fuso- fusor fusus fuudo o-r-b obodo oboro obudu oddur odors odour odudu oduro offof ofosu ofour ooooo orbus ordos ordro orfor orobo orodo oroso orosu oruro ososo ossos ossur osusu ouoro ro-ro robbo robbs robo- robor robur rodbo rodor rodos rofor roods roodu roofs rorbu rosso rosss rosu rsssf rubof rubor rubus rudds rudus ruffo ruffs rufo- rufus rusor russo s-bus s-o-r sfouf so-so sobor soddo soddu sodor sodus soord sooru sorbo sorbs sordo