c-cd cccc cccv ccdc ccdn ccnc ccoc ccod ccvo cdnc cdon cdvd ckck ckco ckcv ckdo cknc ckoc ckoo ckvo cnco cndd cock coco codd cok- coko con- conc cond conk conn cono conv cood cook coon covo cvcc dccc dccv dcon dcvd dddd ddoc dkdc dnoc dock doco dod- dodd dodo doko donc dond donk donn dono dood dook doon dvno kccc kccd kcck kccv kcdc kcdd kcdv kckc kckk kckn kcko kckv kcnd kcno kcnv kcon kcvd kcvk kcvo kcvv kdcc kdcd kdco kddc kddd kddk kdkd kdkk kdkn kdko kdnd kdnk kdnn kdno kdoc kdok kdov kdvv kkcd kkck kkcn kkco kkdc kkdd kkdo kkdv kkkk kknd kknn kkno kkon kkoo kkov kkvv knck kncn knco kndc kndd kndk kndn kndo knkk knnd knnk knoc knod knok knon knvn knvo kocd kock kocn kodk kodo kodv kokc kokk kokn koko konc kond konk kono kooc kook koon kooo koov kovc kovk kovo kvcc kvck kvco kvcv kvnc kvnn kvno kvoc kvod kvok kvon kvoo kvov kvvn kvvv nccc nccn ncdc ncdn ncnc ncnd ncoc ndcc nddo ndoc nkok nkvd nnnn nock noco nodo noko non- nonn nono noo- nook noon nooo noov nov- novo nvcc occc occn ocon oddd odon odoo okko okno okok okon onc- oncd onco ondo onno onod onon oooo ovo- ovod ovon ovoo vcon vdcc vodo vond vonk vonn vooc vovk vvvv