a-a a-z aaa aak aan aao aar aaz aka akk akn ako akr an- ana ank ann ano anr anz aoa aok aon aoo aor ar- ara ark arn aro arr arz az- aza azn azo azz k-z ka- kaa kak kan kao kar kaz kkk kkn kkr kn- kna knk knn kno knr koa kok kon koo kor koz kra krk krn kro krr kzo naa nak nan nao nar naz nka nkk nkn nko nkr nna nnk nnn nno nnz no- noa nok non noo nor noz nra nrk nrn nro nrr nrz nzo nzz oaa oak oan oao oar oka okk oko okr on- ona onk onn ono onr oo- ooa ook oon ooo oor or- ora ork orn oro orr orz oza ozo ozz ra- raa rak ran rao rar raz rkk rko rkz rna rnn rno rnr rnz roa rok ron roo ror roz rra rrk rrn rrr rza rzo zaa zak zan zao zar zaz zka znn zno zo- zoa zok zon zoo zor zro zzr zzz