a-a a-b a-t aaa aab aak aan aao aat aay ab- aba abb abk abn abo abt aby aka akb akk akn ako an- ana anb ank ann ano ant any aoa aob aok aon aoo aot at- ata atb atn ato att ay- aya ayk ayn ayo ayt baa bab bak ban bao bat bay bba bbb bbk bbn bbo bbt bby bka bkb bkk bkn bko bkt bna bnb bnk bnn bno bnt boa bob bok bon boo bot boy bta btb btk btn bto btt bty by- bya byk byn byo byt k-t ka- kaa kab kak kan kao kat kay kba kbb kbk kbn kbo kkb kkk kkn kkt kky kn- kna knk knn kno knt koa kob kok kon koo kot koy kta ktb ktk ktn kto ktt kya kyn kyo kyt naa nab nak nan nao nat nay nba nbb nbk nbn nbo nbt nka nkk nkn nko nkt nky nna nnb nnk nnn nno nnt no- noa nob nok non noo not noy nta ntb ntk ntn nto ntt nya nyk nyn nyo nyt nyy oaa oab oak oan oao oat ob- oba obb obk obn obo obt oby oka okb okk oko on- ona onb onk onn ono ont ony oo- ooa oob ook oon ooo oot ot- ota otb otk otn oto ott oya oyo taa tab tak tan tao tat tay tba tbb tbk tbn tbo tbt tka tkb tkk tko tkt tky tna tnb tnk tnn tno tnt to- toa tob tok ton too tot toy tta ttb ttk ttn tto ttt tty tya tyn tyo tyt yaa yab yak yan yao yat yay yby yka ykk ykn yna ynk ynn yny yob yok yon yoo yot yoy yta ytk ytn yto ytt yyb yyt yyy