b-u bbb bbc bbr bbs bbt bbu bcb bcc bcr bcs bct bcu brb brr brs brt bru bsb bsc bsr bss bst bsu btb btc btr bts btt btu bub buc bur bus but buu c-- cbb cbc cbr cbs cbt cbu ccb ccc ccr ccs cct ccu crb crc crr crs crt cru csb csc csr css cst csu ctb ctc ctr cts ctt ctu cub cuc cur cus cut cuu rbb rbc rbr rbs rbt rbu rcb rcc rcr rcs rct rcu rrb rrc rrr rrs rrt rru rsb rsc rsr rss rst rsu rtb rtc rtr rts rtt rtu rub ruc rur rus rut ruu sbb sbc sbr sbs sbt sbu scb scc scr scs sct scu sr- srb src srr srs srt ss- ssb ssc ssr sss sst ssu stb stc str sts stt stu sub suc sur sus sut suu tbb tbc tbr tbs tbt tbu tcb tcc tcr tcs tct tcu trb trc trr trs trt tru tsb tsc tsr tss tst tsu ttb ttc ttr tts ttt ttu tub tuc tur tus tut tuu ubb ubc ubr ubs ubt ubu ucb ucc ucr ucs uct ucu ur- urb urc urr urs urt uru usb usc usr uss ust usu utb utc utr uts utt utu uuc uur uus uut uuu

bbbb bbbs bbrc bcbc bcbs bccc bccs bcrs bcru bcsc bcss bctc bcts bcuc brcb brrr brrs brsb brsr brst brtc bruc brus brut bscs bssc bsts btcc btcs btrc btrt btss bttb btus bubb bubs bubu bucc bucs bucu bur- burb burr burs burt buru busc buss bust busu but- buts butt buus cbbc cbbs cbcc cbcr cbcs cbct cbcu cbrt cbsc cbtc cbus ccbc cccb cccc cccs cccu ccrc ccrs ccrt ccss ccst cctb cctc cctt ccuc ccus ccut crbc crbu crcc crcr crrt crss crst crtc crts crub crus crut cscb cscc cscr cscs csrc csrs cssr cstc cstr csts csur csus ctbs ctrc ctrs ctsc ctss ctsu ctts cub- cubb cubs cucc curb curr curs curt cusb cuss cust cusu cut- cutc cuts cutt rbbb rbbr rbbs rbss rbst rcbc rccb rccc rccs rcsc rcss rctc rcts rrrr rscc rscs rsts rstu rtcc rtss rtts rubb rubs rubu ruct rurc rurs ruru russ rust rusu ruts rutt rutu sbbs sbcc sbcs sbct sbst sbtc sbus sccc sccs scct scr- scrc scrs scsc scsr scst scsu sctc sctr scts scub scur scut srbc srcc srct srtr srub ssbr sscc sscs ssrc ssrs sssb sssc ssss sstb sstc ssts stbc stbs stcc stcs stcu strc strs stru stss sttc sttr stub stuc stur stus stut sub- subb subs suc- succ sucr sucs sur- surc surr surs surt suru sus- suss sust susu sutu suus tbbs tbcb tbcc tbrb tbst tcbs tccc tccu tctc tcts trcc trst trtc trtr trub truc trus trut truu tsbc tscc tssr tsst tstc tsts ttbb ttss tttt tubb tubr tubs tubu tucc turb turc turr turs turt turu tusc tuss tust tuts tutt tutu ucbc ucrc ucsb ucsc ucst ucsu ucut urbs urss ursu urts urur urus urut usbc usbr usbs uscc uscs ussb ussc ussr usss usst ussu ustb ustc usts usus utsc uttu uuuu

bbsrc bbuss bcbst brrrr bruss brust btr-t btstu bucsu bucur burbs burcu burrs burru burst burts burtt buruc burus burut bussu busts busur busut busuu butts butut c-bus ccccc crust cruts cstcc cubub curbs currs curst curts cutcu cutts rsust rubus rusts rustu ruutu s-bus sccbc scrub scrus sctrs scurr scurt scut- scuts scutt sssrb sssss strrs strub struc strut stubs sturb sturt stuss subbu subss subst sucr- sucst surtr surur surus susus suttu tbtbt tbutt trubs trubu truss trust truus tsrcs tsuru tsuur ttttt ttusb tubbs tuctu turbt turss turst tursu turtu turut tutus tuuru ursus urubu urucu urutu us-sc ustur usutu uttur uturu uuuuu

bbbbbb brbcsc brubru brutus bs-tbs bububu burbur bursts bursuc bursut burutu butucu bututs crusts cucurb cursus curtus cuscus cutcut rubutu ruccus rurutu ruscus russus scrubs scurtu scutus struct strust struts strutt sttstc stubbs sturts suburb succur succus surtur suruc susurr trusts turssu turtur turucu tururu tussur tuttut ubussu

bbbbbbb burruss bustuus cuscusu sssssss structs suburbs succuss sutturu tucuru tut-tut tuttuts

bbbbbbbb buruburu butt-cut cucurucu curucucu subcrust succubus surucucu sussurus susurrus tucutucu

cuss-cuss rusuccuru substruct surucucus tucu-tucu

trusstrust

bbbbbbbbbbbbbbb ccccccccccccccc