c-- ccc ccd cck ccn cco ccu cdc cdd cdk cdn cdo cdu ckc ckd cko cn- cnc cnd cnn cno cnu co- coc cod cok con coo cou cuc cud cuk cun cuo cuu dcc dcd dck dcn dco dcu ddc ddd ddk ddn ddo ddu dkc dkk dko dku dnc dnd dnk dnn dno doc dod dok don doo dou duc dud duk dun duo kcc kcd kck kcn kcu kdc kdk kdo kdu kkc kkk kkn kku kn- knc knd knk knn kno knu koc kod kok kon koo kou kuc kud kuk kun kuu ncc ncd nck ncn nco ncu ndc ndd ndk ndn ndo ndu nkc nkk nkn nko nku nnc nnk nnn nno nnu no- noc nod nok non noo nou nuc nud nuk nun nuo nuu oc- occ ocd ock ocn oco ocu odc odd odn odo odu okc okd okk oko oku on- onc ond onk onn ono onu oo- ooc ood ook oon ooo ou- ouc oud ouk oun ouo ucc ucd uck ucn uco ucu udc udd udk udn udo udu ukc ukk ukn uku un- unc und unk unn uno unu uoc uod uok uon uoo uuc uun uuu

c-cd cccc cccu ccdc ccdn ccnc ccnu ccoc ccod ccuc cdnc cdon ckck ckco ckdo ckdu cknc ckoc ckoo cnco cndd cock coco cocu codd cok- coko con- conc cond conk conn cono cood cook coon coud couk coun cucc cuck cucn cuk- cund cuno cuon dccc dccu dcon dddd ddoc dkdc dnoc dnuk dock doco docu dod- dodd dodo doko donc dond donk donn dono dood dook doon douc doud douk doun duck duco dudd dudo dudu duku dunc dunk dunn duno duo- duon kccc kccd kcck kccu kcdc kcdd kcdu kckc kckk kckn kcko kcnd kcno kcon kcou kcuk kdcc kdcd kdco kddc kddd kddk kdkd kdkk kdkn kdko kdnd kdnk kdnn kdno kdoc kdok kduc kdun kkcd kkck kkcn kkco kkdc kkdd kkdo kkkk kknd kknn kkno kknu kkon kkoo kkuu knck kncn knco kncu kndc kndd kndk kndn kndo kndu knkk knnd knnk knoc knod knok knon knou knud knuk kocd kock kocn kodk kodo kodu kokc kokk kokn koko koku konc kond konk kono kooc kook koon kooo koou kouu kucc kucd kuco kudd kudo kudu kukk kukn kuku kunc kund kunk kuno kunu kuok kuon kuoo kuuk kuuu nccc nccn nccu ncdc ncdn ncdu ncnc ncnd ncoc ncuk ndcc nddo ndoc nkok nnnn nock noco nodo nodu noko non- nonn nono nonu noo- nook noon nooo noun nuck nucu nudc nudd nudo nuku nunc nunk nunn nuno nuoc nuon nuuk occc occn ocon oddd odon odoo odou okcu okko okno okok okon okun onc- oncd onco ondo onno onod onon ooku oooo oucc oudc oun- ound ouu- ucdc ucdd ucon udon udoo uduk udun ukcc ukko uknc ukok ukon uncc unco undo unkn unko unno unon uocc uuno uuoc uuuu

ccccc cnnnn co-co cocc- cocco cocon codco codo codon cokk- conck conco condo connu cono- conon couco cound cucuk cunco cuoco d-con dc-uk dconn ddddd do-do dodon dodoo dokdo dokuo donck dondo donon doodo dooku douck dounk du-ku ducun duddo dudok dudon dudou duduc duduk dukku dukun dundo dunno dunod dunun knock knokk knoud knuck ko-ko kocon kodok kokko kokou kondo konno konnu koonu koudo kouno kucuk kudou kukko kukok kund- kundo kundu kunku nnooo no-do no-no nokko nokon non-u nondo nonno noonu nu-nu nunon nunun odudu okoc okuku onco- onond onoon ooooo oudon u-con uconn ukodo unccd uncod uncok uncon undun unnun unodc uuuuu

cocco- cococo cocoon concon condon connon conoco coocoo coodoo cookoo coudun cuckoo cuddon docock dododo dodunk dok-do dondon doudou duddon dukono dundun dunoon knock- kodkod kodoku kokoku kokoon kokoun koodoo kookoo koudou koukou kukoc kundoo kundun nkonko nnundu no-doc nodock non-no noncon nonkon nonodd nonono nonoon noonoo nounou nukkuu nukunu o-knon okondo oooooo ucuncu udukku uncock uncook undock unnock

cokodok connock conodon cou-cou coundon docodon dododou donodon doo-doo dookudu doudouk dudukcu duk-duk dunnock knockon kokocko kooddoo koundou kundudo kunukku kuokunu noddock non-con noncook nuddock oddduck unknock

coconuco knock-on kukukuku no-knock nokonoko nononono nukunonu

ddddddddd dokkodo douk-douk dundundun

knockknock

knock-knock

ccccccccccccccc doodoodoodoodoo

duckduckduckduckduck