cccc cccf ccee ccfc ccff ccoc ccrc ccre ccrf cec- cece ceco ceec cef- cefc ceke ceor cer- cerc cere cerf cero cfcf cfco cffr cfor cfre ckck ckco cker ckfr ckoc ckoo ckor ckrc coce cock coco cofc cofe coff cok- coke coko coof cook cor- corc core corf cork coro corr crcc crce crcr cre- crec cree creo crfc crkc croc croe crok croo cror eccc ecce ecco ecef ecfc ecfr ecko eco- ecrc ecrf ecrr eeee eefe eeke eeoc eerc eero efco efeo efke efor ekco ekek eker ekfc eore ercc erce erec erer erfc erke eroc eroe eroo errc erre erro f--k fccf fece feck feek feer fefc fefe feff fefo feke feko feof ferc fere ferk fero ferr ffcc ffee ffff ffrr foce fock foco foer fofo foke foof fook for- fore fork foro forr frcc free freo frfc froe kccc kcck kccr kcec kcee kceo kcfc kcfo kckc kckf kckk kcko kckr kcoe kcof kcor kcrc kcro kcrr keck keco kecr keef keek keer kefc keff kefr kekc keke keko keok ker- kerc kere kerf kerk kero kerr kfcf kfco kfcr kfer kfff kffk kfok kfoo kfor kfrc kfre kfro kfrr kkck kkco kkcr kkfr kkkk kkoo kkor kkrc kkre kkrf kkrk kkro kkrr kocf kock kofc kofe koff kofk kofo kokc koke kokf kokk koko kokr kooc kook kooo koor korc kore korf kork koro korr krcc krce krco krec kree kref krek kreo krfc krfe krff krfo krkc krke krkk krko krkr kroc kroe krof krok kroo kror krrc krre krrf krrk krro krrr o-eo occc oce ocee ocef ocke ocre ocro ocrr oec- oecc oeec oere ofcr ofek ofer off- offc offe offo offr ofor ofre oker okko okok okor okre okro oocr ooer ooff oooo oore orce orco ore- orec orek oreo orer orfe orff orke orko oro- oroe orof orok oror orro rccc rcfc recc rece reck recr reef reek refe reff refr reke reko reof rere rero rfef rffc rkkf rocc roce rock roco roer rofc rofe roff rofo roke rokk roko rokr roof rook roor rorc rore rork roro rrfc rrrr