c-- ccc cck cco ccr ccu ccv ckc cko co- coc cok coo cor cou cov crc crk cro crr cru crv cuc cuk cuo cur cuu cuv cvc cvk cvo cvr cvu cvv kcc kck kcr kcu kkc kkk kkr kku kkv koc kok koo kor kou krc krk kro krr kru krv kuc kuk kur kuu kvk kvo kvr kvv oc- occ ock oco ocr ocu ocv okc okk oko okr oku oo- ooc ook ooo oor oov or- orc ork oro orr oru orv ou- ouc ouk ouo our ov- ovc ovo ovv rcc rco rcr rcu rcv rkc rkk rko rku rkv roc rok roo ror rou rov rrc rrk rrr rru ruc ruk ruo rur ruu ruv rvc rvo rvr rvu rvv ucc uck uco ucr ucu ucv ukc ukk ukr uku uoc uok uoo uor ur- urc urk uro urr uru uuc uur uuu uvc uvo uvu uvv vcc vco vcr vcu voc vok voo vor vou vov vrc vrk vrr vru vuk vur vuv vvc vvo vvr vvv

cccc cccu cccv ccoc ccrc ccuc ccvo ckck ckco ckcv ckoc ckoo ckor ckrc ckvo cock coco cocu cok- coko cook cor- corc cork coro corr couk cour covo crcc crcr crkc croc crok croo cror cruk cucc cuck cuk- curo curr cvcc cvrr kccc kcck kccr kccu kccv kckc kckk kcko kckr kckv kcor kcou kcrc kcro kcrr kcru kcrv kcuk kcvk kcvo kcvr kcvu kcvv kkck kkco kkcr kkkk kkoo kkor kkov kkrc kkrk kkro kkrr kkrv kkuu kkvr kkvu kkvv kock kokc kokk koko kokr koku kooc kook kooo koor koou koov korc kork koro korr koru korv kour kouu kovc kovk kovo kovr krcc krco krcu krkc krkk krko krkr krku krkv kroc krok kroo kror krov krrc krrk krro krrr kruc kruk krur krvc krvk krvo krvr krvv kucc kuco kucr kucv kukk kuku kuok kuoo kurk kuro kurr kuru kurv kuuk kuur kuuu kuvo kuvr kvcc kvck kvco kvcr kvcu kvcv kvoc kvok kvoo kvor kvou kvov kvrc kvro kvrr kvrv kvuu kvvr kvvv occc ocro ocrr ocur okcu okko okok okor okro okur oocr ooku oooo orco orko oro- orok oror orro orvr oucc our- ouro ouu- ovo- ovoo rccc rcuv rcvr rocc rock roco rokk roko rokr roku rook roor rorc rork roro roru rouk rovo rrrr ruck rukk ruku ruok rurc ruro ruru ruvu rv-c ucrc ukcc ukko ukok ukrc ukur uocc uor- uovo uro- urok uroo uruk urur uuoc uuuu uv-c uvok uvvu vkor vooc voor vor- voro voru vouk vour vovk vroc vruk vuco vuku vvvv

c-cor ccccc co-co cocc- cocco cocur cokk- coro- corvo couco couru crock croco crook crouk cruck cruor cucuk cukor cuoco curro ko-ko kocov kokko kokor kokou kokur kooru korck korku koror korro koruk kovor kovur krock kucuk kukko kukok kukur kurku kurov kuruc kuruk occur ockro okkur okoc okoro okuku okuru ooooo oovoo oroco oruku oruro ouoro r-co- ro-ro rocco rocko rocor rocou rocov rokkk rouko urour urucu uuork uuuuu uvrou vokov vooru vrock vucko

cocco- cococo coocoo cookoo corour coruco coruro courr- crocco cruro- cuckoo curour curror cururo k-rock kokoku kokoro kookoo korkor kororo koruru koukou kouoro kourou kovrov kovvur krkovo kukoc kukovo kurkcu kurkov kuroko kururu occour ockov ookroo oooooo orrock orrour rococo rokkor rokuko rokuro roucou ruocco v-rock vukovo vvvvvv

cooccur corrour cou-cou currock kokocko kokorou kor-kor korkoro korovou korucuk kuckovo rococco

co-occur cocoroco corocoro cucurucu curucucu kukukuku kukuruku kurukuru rokkurro rokovoko vorovoro

couroucou koukourou roocoocoo

kouroukoro kukkurukuu rococococo vourvourou

ccccccccccccccc