ddd ddk ddn ddo ddt dkk dko dkt dnd dnk dnn dno dnt dod dok don doo dot dtd dtk dtn dto dtt k-t kdk kdo kdt kkk kkn kkt kn- knd knk knn kno knt kod kok kon koo kot ktk ktn kto ktt ndd ndk ndn ndo ndt nkk nkn nko nkt nnk nnn nno nnt no- nod nok non noo not ntd ntk ntn nto ntt odd odn odo odt okd okk oko on- ond onk onn ono ont oo- ood ook oon ooo oot ot- otd otk otn oto ott tdd tdk tdn tdo tdt tkk tko tkt tnd tnk tnn tno tnt to- tod tok ton too tot ttd ttk ttn tto ttt