b-u bbb bbm bbo bbr bbs bbt bbu bmb bmm bmo bmr bms bmt bmu bob bom boo bor bos bot bou brb brm bro brr brs brt bru bsb bsm bso bsr bss bst bsu btb btm bto btr bts btt btu bub bum buo bur bus but buu m-o m-r mbb mbm mbo mbr mbs mbt mbu mmb mmm mmo mmr mms mmt mmu mob mom moo mor mos mot mou mrb mrm mro mrr mrs mrt mru msb msm mso msr mss mst msu mtb mtm mto mtr mts mtt mtu mub mum mur mus mut muu ob- obb obm obo obr obs obt obu om- omb omm omo omr oms omt omu oo- oob oom ooo oor oos oot or- orb orm oro orr ors ort oru os- osb osm oso osr oss ost osu ot- otb otm oto otr ots ott otu ou- oum ouo our ous out rbb rbm rbo rbr rbs rbt rbu rmb rmm rmo rmr rms rmt rob rom roo ror ros rot rou rrb rrm rrr rrs rrt rru rsb rsm rso rsr rss rst rsu rtb rtm rto rtr rts rtt rtu rub rum ruo rur rus rut ruu sbb sbm sbo sbr sbs sbt sbu smb smm smo smr sms smt smu sob som soo sor sos sot sou sr- srb srm sro srr srs srt ss- ssb ssm sso ssr sss sst ssu stb stm sto str sts stt stu sub sum suo sur sus sut suu tbb tbm tbo tbr tbs tbt tbu tmb tmm tmo tmr tms tmt tmu to- tob tom too tor tos tot tou trb trm tro trr trs trt tru tsb tsm tso tsr tss tst tsu ttb ttm tto ttr tts ttt ttu tub tum tuo tur tus tut tuu ubb ubo ubr ubs ubt ubu um- umb umm umo umr ums umt umu uob uom uoo uor uos uot ur- urb urm uro urr urs urt uru usb usm uso usr uss ust usu utb utm uto utr uts utt utu uum uur uus uut uuu

-ous bbbb bbbs bmts bmus bobb bobo bobs bobu bomb boms bomt bomu boob boom boor boos boot bor- borm boro borr bors bort boru bosm boso boss bost bosu botb boto bots bott boum bour bous bout brob brom broo bror bros brot brou brrm brrr brrs brsb brsr brst brum brus brut bsms bsmt bsos bsrm bssm bsts btob btor btrt btss bttb btus bubb bubo bubs bubu bum- bumb bums bur- burb burm buro burr burs burt buru buss bust busu but- buto buts butt buus mbbs mbms mbou mbrs mbus mmmm mmms mmor mmst mmsu mmts mmus mobb mobo mobs momo moms momu moob moor moos moot morb moro mors mort moru moso moss most mosu motb motm moto mots mott motu mour mous mout mrbb mrbm mrbs mrtm mrts mrtt msmb msmm msms msmu msor msrb msrt mssm mssr msst mstr msts msus mtbo mtbs mtom mtor mtrr mtss mtst mttr mtts mubo mubs mumm mumo mums mumu muos muro murr murs murt muru muso muss must musu muto muts mutt mutu muut obbo obor obos obot obro obsr obss obst obts obus ombo ombu omo- omoo omor omro omuo omus ooms oooo ooos oort oost ootb oots oous orbb orbo orbs orbu ormo oro- orom oror oros orot orro orrs orso orsu orto orts orub orum orus osm- osmo osoo osor osos osro ossb osso ossu ostr osts osum otbs oto- otoo otor otos otro otrs otso otsu otto otts ottu otur otus oubs our- ouro ours ourt oust out- outb outo outs ouu- rbbb rbbr rbbs rbms rbss rbst rmbs rmst rmtu rob- robb robo robs robt robu romb romm romo roms roob room roor roos root roro rort roru roso ross rost roto rotr rots rott roub roum rous rout rrrr rrum rsos rsts rstu rsum rtms rtss rtts rubb rubs rubu rumb rumm rumo rums rumt ruro rurs ruru ruso russ rust rusu ruto ruts rutt rutu s-os sbbs sbor sbot sbst sbus smos smot smrt smss smtu smur smus smut sobo sobr sobs sobt sobu somb somm somo soom soor soos soot sorb sorm soro sorr sors sort soru soso soss sost sotm soto sots sotu soum sour sous sout sros srtr srub ssbr ssot ssrm ssrs sssb sssm ssss sstb ssts stbs stms stmt stob stom stoo stor stos stot stou stro strs stru stsm stss sttr stub stum stur stus stut sub- subb subm subo subs sum- sumo sums sumu suor suos sur- suro surr surs surt suru sus- suso suss sust susu suto sutu suum suus t-mo tbbs tbrb tbst tmbr tmos tmou tmro tmtt tobo tobs tobt tobu tomb tomm tomo toms tomt toom toor toos toot torm toro torr tors tort toru tosb toso toss tost tosu totm toto totr tots tott toum tour tous tout trmb trms trmu trom troo tros trot trou trst trtr trub trus trut truu tsob tsom tsos tsou tssm tssr tsst tstm tsts tsum ttbb ttms ttss tttt tubb tubo tubr tubs tubu tumb tums tumu tuor tuos turb turm turo turr turs turt turu tusm tuss tust tuto tuts tutt tutu tuum tuuo ubbo ubos umb- umbo ummo umms umor umsu umts umus umut uomo uor- urbs uro- urom uroo urso urss ursu urts urum urur urus urut usbr usbs usmm usms usos ussb ussr usss usst ussu ustb ustm usto usts usus utmb utor utto uttu uuuu

bbuss bmrst bo-bo bobos bobr bobst bobts bombo bombs bomso boobs boomb booms boors boort booru boost boots borbo bormo boro- borom boroo boros borot borou borro borst borsu borts borum borus borut bosom bosor bosso bosut botom botos botou botro botts bottu botus bours boust bouto bouts brmmm brobo brobs brom- bromo broom broos bross broto brous brout brrrr brumm bruss brust bsous btr-t btstu bttms bumbo bumbu burbs buroo buros burro burrs burru burst burts burtt burus burut busot busso bussu