ddd ddk ddn ddo dds dkk dko dks dnd dnk dnn dno dns dod dok don doo dos dsd dsk dsn dso dss kdk kdo kds kkk kkn kks kn- knd knk knn kno kod kok kon koo kos ksd ksk ksn kso kss ndd ndk ndn ndo nds nkk nkn nko nks nnk nnn nno nns no- nod nok non noo nos nsd nsk nsn nso nss odd odn odo ods okd okk oko oks on- ond onk onn ono ons oo- ood ook oon ooo oos os- osd osk osn oso oss sdd sdk sdn sdo sds sk- skd skk sko sks snd snk snn sno sns sod sok son soo sos ss- ssd ssk ssn sso sss