f--k ffff ffss flok floo flos fofo folk foll folo fols foof fook fool foos foso foss fsfo fssf k-lo k-os kfff kffk kflf kfll kflo kfls kfok kfoo kfsk kkfs kkkk kklf kkll kklo kkls kkol kkoo kksf kkss klff klkk klkl klko klks kllk klls klok klol kloo klos klsf koff kofk kofo kokf kokk koko koks kolf kolk koll kolo kols kook kool kooo koos kos- kosf koso koss ksfo kskf kskk ksko ksks kslk ksll kslo ksof ksok ksol ksoo ksos kssl ksso ksss lkfs llks llll lloo loff lokk loko loll lolo lols loof look lool loos loso loss lsof lsso off- offo offs okko oklo okok okol okso olfs ollo olof olos ooff oofs oolo oooo ooos oslo osoo osos osso s-os sfls sfos sfss skol skss sloo slos sofo sokk soko solf solk soll solo sols soof sook sool soos soso soss ssfl sssf ssss