a-a a-b a-i aaa aab aai aak aan aao aay ab- aba abb abi abk abn abo aby ai- aia aib aii aik ain aio aiy aka akb aki akk akn ako an- ana anb ani ank ann ano any aoa aob aoi aok aon aoo ay- aya ayi ayk ayn ayo baa bab bai bak ban bao bay bba bbb bbi bbk bbn bbo bby bi- bia bib bii bik bin bio biy bka bkb bkk bkn bko bna bnb bni bnk bnn bno boa bob boi bok bon boo boy by- bya byi byk byn byo ia- iaa iab iai ian iao iba ibb ibi ibk ibn ibo iby iia iib iii iin iio ika ikb iki ikk iko in- ina inb ini ink inn ino iny io- ioa iob ioi ion ioo iya iyo iyy ka- kaa kab kai kak kan kao kay kba kbb kbi kbk kbn kbo kia kib kii kik kin kio kkb kki kkk kkn kky kn- kna kni knk knn kno koa kob koi kok kon koo koy kya kyn kyo n-i naa nab nai nak nan nao nay nba nbb nbi nbk nbn nbo nia nib nii nik nin nio nka nki nkk nkn nko nky nna nnb nni nnk nnn nno no- noa nob noi nok non noo noy nya nyk nyn nyo nyy o-i oaa oab oai oak oan oao ob- oba obb obi obk obn obo oby oia oib oii oik oin oio oka okb oki okk oko on- ona onb oni onk onn ono ony oo- ooa oob ooi ook oon ooo oya oyi oyo yaa yab yai yak yan yao yay ybi yby yii yin yio yka yki ykk ykn yna ynk ynn yny yob yoi yok yon yoo yoy yyb yyy