bbbb bbbs bbfc bbrc bcbc bcbs bccc bccs bcfc bcof bcor bcos bcrs bcsc bcss bctc bcts bfcs bffs bfsr bfts bftt bobb bobo bobs boco bocs boff bofs boob booc boof boor boos boot bor- borf boro borr bors bort bosc boso boss bost botb boto bots bott brcb brfc brob broc broo bror bros brot brrr brrs brsb brsr brst brtc bscs bsfc bsff bsfs bsos bssc bsts btcc btcs btfc btob btor btrc btrt btss bttb c-bo cbbc cbbs cbcc cbcr cbcs cbct cbfb cbfc cbot cbrt cbsc cbtc cbtf ccbc cccb cccc cccf cccs ccfc ccff ccob ccoc ccrc ccrf ccrs ccrt ccsf ccss ccst cctb cctc cctt cfbc cfbr cfbs cfbt cfcb cfcf cfco cfcs cffb cffr cfor cfos cfrb cfrt cftc cftr cobb cobo cobs coco coct 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 crbc crcc crcr crfc crfs crob croc croo cror crot crrt crss crst crtc crtf crts csbf cscb cscc cscf csco cscr cscs csfc csfr csob csor csos csot csrc csrs cssr cstc csto cstr csts ctbs ctcf ctfc ctfo ctfs ctor ctos ctot ctrc ctrs ctsc ctss ctts fbrs 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 frbc frcc frfc frob fros frot frsb frsc frso frst fscb fscc fsfo fssc fssf ft-c ftfc ftos ftrs ftsr obbo obor obos obot obro obsr obss obst obts ocbc occc occt ocos ocro ocrr ocrs oct- octo octs ofcr off- offc offo offr offs ofor ofst oocr ooff oofs oooo ooos oort oost ootb oots orbb orbo orbs orco orcs orff orfs oro- orof oror oros orot orro orrs orso ortc orto orts oscc osco osoo osor osos osro ossb osso ostc ostr osts otbs otfc oto- otof otoo otor otos otro otrs otso otto otts rbbb rbbr rbbs rbss rbst rcbc rcbo rccb rccc rccs rcfc rcos rcsc rcss rctc rcts rffc rftc rob- robb robo robs robt rocc roco rocs rofc roff rofo roob roof roor roos root rorc roro rort rosc roso ross rost rotc roto rotr rots rott rrfc rrrr rscc rscs rsfc rsos rsts rtbf rtcc rtfb rtfc rtss rtts s-os sbbs sbcc sbcs sbct sbfc sbor sbot sbst sbtc sccc sccs scct scfc scob scoo scor scot scr- scrc scrs scsc scso scsr scst sctc scto sctr scts sfbc sfcc sfco sfcs sffc sfor sfos sfrc sfro sfss sfts sobo sobr sobs sobt soco socr socs sofo soft soof soor soos soot sorb soro sorr sors sort soso soss sost sotc soto sots srbc srcc srct srfc sros srtr ssbr sscc sscs ssfc ssoc ssot ssrc ssrs sssb sssc sssf ssss sstb sstc ssts stbc stbs stcc stcs stfc stob stof stoo stor stos stot strc stro strs stsf stss sttc sttr tbbs tbcb tbcc tbrb tbst tcbs tccc tcfc tcos tctc tcts tfot tfrs tfss tftc tobo tobs tobt toco toff tofo toft toof toor toos toot torc torf toro torr tors tort tosb tosc toso toss tost totc toto totr tots tott trcc trfc trfr troc troo tros trot trst trtc trtr tsbc tscc tsfc tsob tsos tssf tssr tsst tstc tsts ttbb ttfc ttff ttss tttt