cccc cccu ccnc ccnr ccnu ccoc ccrc ccuc ckck ckco cknc ckoc ckoo ckor ckrc cnco cnrc cnrr cock coco cocu cok- coko con- conc conk conn cono cook coon cor- corc cork corn coro corr couk coun cour crcc crcr crkc croc crok cron croo cror cruk crun cucc cuck cucn cuk- cuno cuon curn curo curr kccc kcck kccr kccu kckc kckk kckn kcko kckr kcno kcnr kcon kcor kcou kcrc kcrn kcro kcrr kcru kcuk kkck kkcn kkco kkcr kkkk kknn kkno kknu kkon kkoo kkor kkrc kkrk kkrn kkro kkrr kkuu knck kncn knco kncr kncu knkk knnk knnr knoc knok knon knor knou knrk knro knuk knur kock kocn kokc kokk kokn koko kokr koku konc konk kono kooc kook koon kooo koor koou korc kork korn koro korr koru kour kouu krcc krcn krco krcu krkc krkk krkn krko krkr krku krnk krnn krno krnu kroc krok kroo kror krrc krrk krrn krro krrr kruc kruk krun krur kucc kuco kucr kukk kukn kuku kunc kunk kuno kunr kunu kuok kuon kuoo kurk kuro kurr kuru kuuk kuur kuuu nccc nccn nccr nccu ncnc ncoc ncor ncrc ncuk nkok nkor nnnn nock noco noko non- nonn nono nonu noo- nook noon nooo noor nor- norc nork norn noro norr noun nour nroc nron nrrc nuck nucu nuku nunc nunk nunn nuno nuoc nuon nurc nurn nurr nuru nuuk occc occn ocon ocro ocrr ocur okcu okko okno okok okon okor okro okun okur onc- onco onno onon onor onur oocr ooku oooo orco orko ornc orno oro- orok oron oror orro oucc oun- our- ourn ouro ouu- rccc rcnr rcon rnco rocc rock roco rokk roko rokr roku ronc ronk rono rook roon roor rorc rork roro roru rouk roun rrrr rrun ruck rukk rukn ruku runc runk runn runo ruok rurc ruro ruru ruun ucon ucrc ukcc ukko uknc ukok ukon ukrc ukur uncc unco unkn unko unno unon unro uocc uor- uro- urok uroo uruk urun urur uuno uuoc uuuu