b-u bbb bbc bbf bbo bbr bbs bbt bbu bcb bcc bcf bco bcr bcs bct bcu bfb bfc bff bfo bfr bfs bft bfu bob boc bof boo bor bos bot bou brb brf bro brr brs brt bru bsb bsc bsf bso bsr bss bst bsu btb btc btf bto btr bts btt btu bub buc buf buo bur bus but buu c-- cbb cbc cbf cbo cbr cbs cbt cbu ccb ccc ccf cco ccr ccs cct ccu cfb cfc cff cfo cfr cfs cft cfu co- cob coc cof coo cor cos cot cou crb crc crf cro crr crs crt cru csb csc csf cso csr css cst csu ctb ctc ctf cto ctr cts ctt ctu cub cuc cuf cuo cur cus cut cuu fbb fbc fbf fbo fbr fbs fbt fbu fcb fcc fcf fco fcr fcs fct fcu ffc fff ffo ffr ffs fft ffu fob foc fof foo for fos fot fou frb frc frf fro frr frs frt fru fsb fsc fsf fso fsr fss fst fsu ftb ftc ftf fto ftr fts ftt ftu fub fuf fuo fur fus fut fuu ob- obb obc obf obo obr obs obt obu oc- ocb occ ocf oco ocr ocs oct ocu of- ofb ofc off ofo ofr ofs oft ofu oo- oob ooc oof ooo oor oos oot or- orb orc orf oro orr ors ort oru os- osb osc osf oso osr oss ost osu ot- otb otc otf oto otr ots ott otu ou- ouc ouf ouo our ous out rbb rbc rbf rbo rbr rbs rbt rbu rcb rcc rcf rco rcr rcs rct rcu rfb rfc rff rfo rfr rfs rft rfu rob roc rof roo ror ros rot rou rrb rrc rrf rrr rrs rrt rru rsb rsc rsf rso rsr rss rst rsu rtb rtc rtf rto rtr rts rtt rtu rub ruc ruf ruo rur rus rut ruu sbb sbc sbf sbo sbr sbs sbt sbu scb scc scf sco scr scs sct scu sfb sfc sff sfo sfr sfs sft sfu sob soc sof soo sor sos sot sou sr- srb src srf sro srr srs srt ss- ssb ssc ssf sso ssr sss sst ssu stb stc stf sto str sts stt stu sub suc suf suo sur sus sut suu tbb tbc tbf tbo tbr tbs tbt tbu tcb tcc tcf tco tcr tcs tct tcu tfb tfc tff tfo tfr tfs tft tfu to- tob toc tof too tor tos tot tou trb trc trf tro trr trs trt tru tsb tsc tsf tso tsr tss tst tsu ttb ttc ttf tto ttr tts ttt ttu tub tuc tuf tuo tur tus tut tuu ubb ubc ubf ubo ubr ubs ubt ubu ucb ucc ucf uco ucr ucs uct ucu ufc uff ufo ufr ufs uft ufu uob uoc uoo uor uos uot ur- urb urc urf uro urr urs urt uru usb usc usf uso usr uss ust usu utb utc utf uto utr uts utt utu uuc uur uus uut uuu

-ous bbbb bbbs bbfc bbrc bcbc bcbs bccc bccs bcfc bcof bcor bcos bcrs bcru bcsc bcss bctc bcts bcuc bfcs bffs bfsr bfts bftt bobb bobo bobs bobu boco bocs bocu boff bofs bofu boob booc boof boor boos boot bor- borf boro borr bors bort boru bosc boso boss bost bosu botb boto bots bott bouf bour bous bout brcb brfc brfu brob broc broo bror bros brot brou brrr brrs brsb brsr brst brtc bruc brus brut bscs bsfc bsff bsfs bsos bssc bsts btcc btcs btfc btob btor btrc btrt btss bttb btus bubb bubo bubs bubu bucc buco bucs bucu bufc buff bufo bufr bur- burb buro burr burs burt buru busc buss bust busu but- buto buts butt buus c-bo cbbc cbbs cbcc cbcr cbcs cbct cbcu cbfb cbfc cbot cbrt cbsc cbtc cbtf cbus ccbc cccb cccc cccf cccs cccu ccfc ccff ccob ccoc ccrc ccrf ccrs ccrt ccsf ccss ccst cctb cctc cctt ccuc ccus ccut cfbc cfbr cfbs cfbt cfcb cfcf cfco cfcs cffb cffr cfor cfos cfrb cfrt cftc cftr cobb cobo cobs cobu coco coct cocu cofc coff cofs coft coob coof coos coot cor- corb corc corf coro corr cors cort cosc coso coss cost cotb cotc coto cots cott cotu coub cour cous cout crbc crbu crcc crcr crfc crfs crob croc croo cror crot crrt crss crst crtc crtf crts crub crus crut csbf cscb cscc cscf csco cscr cscs csfc csfr csob csor csos csot csrc csrs cssr cstc csto cstr csts csuf csur csus ctbs ctcf ctfc ctfo ctfs ctor ctos ctot ctrc ctrs ctsc ctss ctsu ctts cub- cubb cubs cucc cufc cuff cufo curb curf curo curr curs curt cusb cuso cuss cust cusu cut- cutc cuto cuts cutt fbrs fbus fcbs fccf fcot fcsc fcst fcto ffcc ffff ffrr ffss fftf fobs fobt foco focs fofo foof foos foot for- forb foro forr fors fort fosb foso foss fost foto fots fott four fous fout frbc frcc frfc frob fros frot frou frsb frsc frso frst frub fscb fscc fsfo fssc fssf ft-c ftfc ftos ftrs ftsr ftub ftuc fubb fubs fubu fuc- fuct fufc fuff fufu fuor fur- furo furr furs furt fusc fuso fuss fust fusu futo futs futu obbo obor obos obot obro obsr obss obst obts obus ocbc occc occt ocos ocro ocrr ocrs oct- octo octs ocur ofcr off- offc offo offr offs offu ofor ofst ofus oocr ooff oofs oooo ooos oort oost ootb oots oous orbb orbo orbs orbu orco orcs orff orfs orfu oro- orof oror oros orot orro orrs orso orsu ortc orto orts orub orus oscc osco osoo osor osos osro ossb osso ossu ostc ostr osts otbs otfc oto- otof otoo otor otos otro otrs otso otsu otto otts ottu otur otus oubs oucc oufc ouff our- ouro ours ourt oust out- outb outo outs ouu- rbbb