a-a a-b a-i a-z aaa aab aai aak aan aao aaz ab- aba abb abi abk abn abo abz ai- aia aib aii aik ain aio aiz aka akb aki akk akn ako an- ana anb ani ank ann ano anz aoa aob aoi aok aon aoo az- aza azb azi azn azo azz baa bab bai bak ban bao baz bba bbb bbi bbk bbn bbo bi- bia bib bii bik bin bio biz bka bkb bkk bkn bko bna bnb bni bnk bnn bno bnz boa bob boi bok bon boo boz bza bzn bzo bzz ia- iaa iab iai ian iao iaz iba ibb ibi ibk ibn ibo ibz iia iib iii iin iio ika ikb iki ikk iko in- ina inb ini ink inn ino io- ioa iob ioi ion ioo iza izi izo izz k-z ka- kaa kab kai kak kan kao kaz kba kbb kbi kbk kbn kbo kbz kia kib kii kik kin kio kiz kkb kki kkk kkn kn- kna kni knk knn kno koa kob koi kok kon koo koz kzo n-i naa nab nai nak nan nao naz nba nbb nbi nbk nbn nbo nia nib nii nik nin nio niz nka nki nkk nkn nko nna nnb nni nnk nnn nno nnz no- noa nob noi nok non noo noz nzb nzi nzo nzz o-i oaa oab oai oak oan oao ob- oba obb obi obk obn obo oia oib oii oik oin oio oiz oka okb oki okk oko on- ona onb oni onk onn ono oo- ooa oob ooi ook oon ooo oza ozo ozz zaa zab zai zak zan zao zaz zbb zia zib zik zin zio ziz zka znn zno zo- zoa zob zoi zok zon zoo zzz