cccc cccf cccs ccfc ccff ccoc ccrc ccrf ccrs ccrt ccsf ccss ccst cctc cctt cfcf cfco cfcs cffr cfor cfos cfrt cftc cftr coco coct cofc coff cofs coft coof coos coot cor- corc corf coro corr cors cort cosc coso coss cost cotc coto cots cott crcc crcr crfc crfs croc croo cror crot crrt crss crst crtc crtf crts cscc cscf csco cscr cscs csfc csfr csor csos csot csrc csrs cssr cstc csto cstr csts ctcf ctfc ctfo ctfs ctor ctos ctot ctrc ctrs ctsc ctss ctts fccf fcot fcsc fcst fcto ffcc ffff ffrr ffss fftf foco focs fofo foof foos foot for- foro forr fors fort foso foss fost foto fots fott frcc frfc fros frot frsc frso frst fscc fsfo fssc fssf ft-c ftfc ftos ftrs ftsr occc occt ocos ocro ocrr ocrs oct- octo octs ofcr off- offc offo offr offs ofor ofst oocr ooff oofs oooo ooos oort oost oots orco orcs orff orfs oro- orof oror oros orot orro orrs orso ortc orto orts oscc osco osoo osor osos osro osso ostc ostr osts otfc oto- otof otoo otor otos otro otrs otso otto otts rccc rccs rcfc rcos rcsc rcss rctc rcts rffc rftc rocc roco rocs rofc roff rofo roof roor roos root rorc roro rort rosc roso ross rost rotc roto rotr rots rott rrfc rrrr rscc rscs rsfc rsos rsts rtcc rtfc rtss rtts s-os sccc sccs scct scfc scoo scor scot scr- scrc scrs scsc scso scsr scst sctc scto sctr scts sfcc sfco sfcs sffc sfor sfos sfrc sfro sfss sfts soco socr socs sofo soft soof soor soos soot soro sorr sors sort soso soss sost sotc soto sots srcc srct srfc sros srtr sscc sscs ssfc ssoc ssot ssrc ssrs sssc sssf ssss sstc ssts stcc stcs stfc stof stoo stor stos stot strc stro strs stsf stss sttc sttr tccc tcfc tcos tctc tcts tfot tfrs tfss tftc toco toff tofo toft toof toor toos toot torc torf toro torr tors tort tosc toso toss tost totc toto totr tots tott trcc trfc trfr troc troo tros trot trst trtc trtr tscc tsfc tsos tssf tssr tsst tstc tsts ttfc ttff ttss tttt