cccc cccf cccl cccs ccfc ccff ccfl cclc ccls ccoc ccsf ccsl ccss cfcf cfcl cfco cfcs cfls cfos cfsl ckck ckcl ckco ckcs cklf ckoc ckoo ckos cksl ckso clof clok cloo clos clsc cock coco cofc coff cofs cok- coko col- colk coll colo cols coof cook cool coos cosc cosl coso coss cscc cscf cscl csco cscs csfc csks csos f--k fccf fcsc fcsl ffcc ffff ffss flcl floc flok floo flos fock foco focs fofo folc folk foll folo fols foof fook fool foos foso foss fscc fsck fsfo fssc fssf k-lo k-os kccc kcck kccl kcfc kcfl kcfo kckc kckf kckk kckl kcko kclc kclf kclk kcll kcls kcof kcol kcos kcsc kcsf kcss kfcf kfco kfcs kfff kffk kflc kflf kfll kflo kfls kfok kfoo kfsk kkck kkcl kkco kkcs kkfs kkkk kklc kklf kkll kklo kkls kkol kkoo kksf kkss klcc klck klcl klcs klfc klff klkc klkk klkl klko klks kllc kllk klls kloc klok klol kloo klos klsc klsf kocf kock kocs kofc koff kofk kofo kokc kokf kokk koko koks kolc kolf kolk koll kolo kols kooc kook kool kooo koos kos- kosc kosf koso koss ksck kscl ksco kscs ksfc ksfo kskf kskk ksko ksks kslc kslk ksll kslo ksoc ksof ksok ksol ksoo ksos kssl ksso ksss lccc lccs lcfc lcls lcsc lfcc lkfs llcc llcs llks lllc llll lloc lloo locc lock loco locs loff lokk loko loll lolo lols looc loof look lool loos losc loso loss lsco lscs lsfc lsof lsso occc ocks oclc ocos ofcl off- offc offo offs okko oklo okok okol okso olcc olfs ollo olof olos ooff oofs oolo oooo ooos oscc oscl osco oslo osoo osos osso s-os sccc sccl sccs scfc sck- sckl scl- sclc sclk scls scok scol scoo scsc scsl scso sfcc sfco sfcs sffc sflc sfls sfos sfss skfc skol skss slcc sloc sloo slos slsc sock socl soco socs sofo sokk soko solf solk soll solo sols soof sook sool soos soso soss sscc sscs ssfc ssfl sslc ssoc sssc sssf ssss