f--k ffff ffrr fofo foof fook for- fork foro forr fowk frow kfff kffk kfok kfoo kfor kfro kfrr kfrw kfwr kkfr kkkk kkoo kkor kkow kkrf kkrk kkro kkrr kkwf kkwk koff kofk kofo kokf kokk koko kokr kook kooo koor korf kork koro korr kowr krff krfo krkk krko krkr krkw krof krok kroo kror krow krrf krrk krro krrr krrw krwk krwr kwfr kwkk kwkr kwkw kwof kwok kwor kwow kwrf kwrk kwro kwrr kwrw kwwf kwwk kwwr off- offo offr ofor okko okok okor okro ooff oooo orff orko oro- orof orok oror orro orwo owow rkkf roff rofo rokk roko rokr roof rook roor rork roro rowf rowk rowr roww rrrr wfff wfor wfrf wfrk wfro wfrw wfwo wkff wkkf wkko wkkr wkkw wkok wkoo wkor wkow wkrk wkro wkrr wkwf woff wofr wokk woko wokr wokw woof wook woow worf work woro worr worw wowf wowo woww wrff wrfk wrfw wrkf wrkk wrko wrkr wrkw wrok wroo wrow wrrk wrro wrrw wrwr wwfr wwfw wwkf wwkr wwof wwor wwow wwrf wwrk wwrr wwrw wwwk wwwr wwww