b-u bbb bbf bbm bbo bbr bbs bbu bfb bff bfm bfo bfr bfs bfu bmb bmf bmm bmo bmr bms bmu bob bof bom boo bor bos bou brb brf brm bro brr brs bru bsb bsf bsm bso bsr bss bsu bub buf bum buo bur bus buu fbb fbf fbm fbo fbr fbs fbu fff ffm ffo ffr ffs ffu fmb fmf fmm fmo fmr fms fmu fob fof fom foo for fos fou frb frf frm fro frr frs fru fsb fsf fsm fso fsr fss fsu fub fuf fum fuo fur fus fuu m-f m-o m-r mbb mbf mbm mbo mbr mbs mbu mfb mff mfm mfo mfr mfs mfu mmb mmf mmm mmo mmr mms mmu mob mof mom moo mor mos mou mrb mrf mrm mro mrr mrs mru msb msf msm mso msr mss msu mub muf mum mur mus muu ob- obb obf obm obo obr obs obu of- ofb off ofm ofo ofr ofs ofu om- omb omf omm omo omr oms omu oo- oob oof oom ooo oor oos or- orb orf orm oro orr ors oru os- osb osf osm oso osr oss osu ou- ouf oum ouo our ous rbb rbf rbm rbo rbr rbs rbu rfb rff rfm rfo rfr rfs rfu rmb rmf rmm rmo rmr rms rob rof rom roo ror ros rou rrb rrf rrm rrr rrs rru rsb rsf rsm rso rsr rss rsu rub ruf rum ruo rur rus ruu sbb sbf sbm sbo sbr sbs sbu sfb sff sfm sfo sfr sfs sfu smb smf smm smo smr sms smu sob sof som soo sor sos sou sr- srb srf srm sro srr srs ss- ssb ssf ssm sso ssr sss ssu sub suf sum suo sur sus suu ubb ubf ubo ubr ubs ubu uff ufm ufo ufr ufs ufu um- umb umf umm umo umr ums umu uob uom uoo uor uos ur- urb urf urm uro urr urs uru usb usf usm uso usr uss usu uum uur uus uuu

-ous bbbb bbbs bffs bfsr bmus bobb bobo bobs bobu boff bofs bofu bomb boms bomu boob boof boom boor boos bor- borf borm boro borr bors boru bosm boso boss bosu bouf boum bour bous brfm brfu brob brom broo bror bros brou brrm brrr brrs brsb brsr brum brus bsff bsfs bsms bsos bsrm bssm bubb bubo bubs bubu buff bufo bufr bum- bumb bumf bums bur- burb burm buro burr burs buru buss busu buus fbom fbrs fbus ffff ffrr ffss fmsr fmss fobs fofo fomo foof foom foos for- forb form foro forr fors fosb foso foss four fous frob from fros frou frsb frsm frso frub frum fsfo fssf fubb fubs fubu fuff fufu fumo fums fuor fur- furm furo furr furs fuso fuss fusu mbbs mbms mbou mbrs mbsf mbus mfbm mfor mfou mfrs mfsb mmff mmmm mmms mmor mmrf mmsu mmus mobb mobo mobs moff mofo mofu momo moms momu moob moor moos morb morf moro mors moru moso moss mosu mouf mour mous mrbb mrbm mrbs msff msfs msmb msmm msms msmu msor msrb mssf mssm mssr msus mubo mubs muff mufu mumm mumo mums mumu muos muro murr murs muru muso muss musu obbo obor obos obro obsr obss obus off- offo offr offs offu ofor ofus ombo ombu omo- omoo omor omro omuo omus ooff oofs ooms oooo ooos oous orbb orbo orbs orbu orff orfs orfu ormo oro- orof orom oror oros orro orrs orso orsu orub orum orus osm- osmo osoo osor osos osro ossb osso ossu osum oubs ouff our- ouro ours ouu- rbbb rbbr rbbs rbms rbss rmbs rob- robb robo robs robu roff rofo romb romm romo roms roob roof room roor roos roro roru roso ross roub rouf roum rous rrrr rrum rsos rsum rubb rubs rubu ruff rufo rumb rumm rumo rums ruro rurs ruru ruso russ rusu s-os sbbs sbor sbus sfmm sfor sfos sfro sfss sfsu smbf smof smos smrf smss smur smus sobo sobr sobs sobu sofo somb somm somo soof soom soor soos sorb sorm soro sorr sors soru soso soss souf soum sour sous sros srub ssbr ssrm ssrs sssb sssf sssm ssss sub- subb subm subo subs suf- suff sufr sufs sufu sum- sumo sums sumu suor suos sur- surf suro surr surs suru sus- suso suss susu suum suus ubbo ubos ufms ufos umb- umbo umff ummo umms umor umsu umus uofm uofo uomo uor- urbs urff uro- urom uroo urso urss ursu urum urur urus usbr usbs usfs usmm usms usos ussb ussf ussr usss ussu usus uuuu

-form bbuss bmfms bo-bo bobos bobr boffo boffs bombo bombs bomso boobs boofs boomb boomf booms boors booru borbo bormo boro- borom boroo boros borou borro borsu borum borus bosom bosor bosso bours brmmm brobo brobs brom- bromo broom broos bross brous brrrr bruff brumm bruss bsous buffo buffs bufos bumbo bumbu burbs buroo buros burro burrs burru burus busso bussu busum busur busuu fbomb fmous fofos fofum fomor forbs form- forms foros forro forso forss forum forur forus fourb fourm fouro fours frobs fromm froom fu-fu fubbs fubus fuffs furbo furo- furor furrs furus fuso- fusor fusus mboro mburu mmfbm mmmmm mobbs mobor mobos mobro moffo mofus mombo mombu momos momus moobs mooro moors morbo morfs morfu mormo moror moros morou morro morso morss morum morus mosor mosso mosuo moufs mours mrmom mrmos mroof mrorr muffs mumbo mummu murom muror muros murro murru murum murus musos musou musso o-r-b oboro obrom offof ofosu ofour ofrum omoro ooooo orbom orbus orfor ormur ormus orobo oromo oroso orosu orrum oruro osmo- osmos ososo ossos ossur osusu ouoro ro-ro robbo robbs robo- robor robur rofor romfo romfs romos roofs rooms roomu rorbu rosfm rosmo rosso rosss rosu rosum roumm rsssf rubof rubor rubus ruffo ruffs rufo- rufus rumbo rummo rummu rumor rumos ruoms ruomu rus-m rusor russo s-bus s-o-r sfouf smbus smoms smoor smous smurf smurr