cccc cccf cccs ccfc ccff ccoc ccrc ccrf ccrs ccsf ccss cfcf cfco cfcs cffr cfor cfos ckck ckco ckcs ckfr ckoc ckoo ckor ckos ckrc ckso cock coco cofc coff cofs cok- coko coof cook coos cor- corc corf cork coro corr cors cosc coso coss crcc crcr crfc crfs crkc croc crok croo cror crss cscc cscf csco cscr cscs csfc csfr csks csor csos csrc csrs cssr f--k fccf fcsc ffcc ffff ffrr ffss fock foco focs fofo foof fook foos for- fork foro forr fors foso foss frcc frfc fros frsc frso fscc fsck fsfo fssc fssf k-os kccc kcck kccr kcfc kcfo kckc kckf kckk kcko kckr kcof kcor kcos kcrc kcro kcrr kcrs kcsc kcsf kcsr kcss kfcf kfco kfcr kfcs kfff kffk kfok kfoo kfor kfrc kfro kfrr kfrs kfsk kfsr kkck kkco kkcr kkcs kkfr kkfs kkkk kkoo kkor kkrc kkrf kkrk kkro kkrr kkrs kksf kksr kkss kocf kock kocs kofc koff kofk kofo kokc kokf kokk koko kokr koks kooc kook kooo koor koos korc korf kork koro korr kors kos- kosc kosf koso kosr koss krcc krco krcs krfc krff krfo krfs krkc krkk krko krkr krks kroc krof krok kroo kror kros krrc krrf krrk krro krrr krrs krsc krsf krsk krsr krss ksck ksco kscr kscs ksfc ksfo ksfr kskf kskk ksko kskr ksks ksoc ksof ksok ksoo ksor ksos ksrf ksro ksrr ksrs ksso kssr ksss occc ocks ocos ocro ocrr ocrs ofcr off- offc offo offr offs ofor okko okok okor okro okso oocr ooff oofs oooo ooos orco orcs orff orfs orko oro- orof orok oror oros orro orrs orsk orso oscc osco osoo osor osos osro osso rccc rccs rcfc rcos rcsc rcss rffc rkkf rkos rkss rocc rock roco rocs rofc roff rofo rokk roko rokr roks roof rook roor roos rorc rork roro rosc roso ross rrfc rrrr rscc rscs rsfc rsos s-os sccc sccs scfc sck- scok scoo scor scr- scrc scrs scsc scso scsr sfcc sfco sfcs sffc sfor sfos sfrc sfro sfss skfc skor skss sock soco socr socs sofo sokk soko soof sook soor soos soro sorr sors soso soss srcc srfc sros sscc sscs ssfc ssoc ssrc ssrs sssc sssf ssss