a-a a-b a-t aaa aab aan aao aat aay ab- aba abb abn abo abt aby an- ana anb ann ano ant any aoa aob aon aoo aot at- ata atb atn ato att ay- aya ayn ayo ayt baa bab ban bao bat bay bba bbb bbn bbo bbt bby bna bnb bnn bno bnt boa bob bon boo bot boy bta btb btn bto btt bty by- bya byn byo byt naa nab nan nao nat nay nba nbb nbn nbo nbt nna nnb nnn nno nnt no- noa nob non noo not noy nta ntb ntn nto ntt nya nyn nyo nyt nyy oaa oab oan oao oat ob- oba obb obn obo obt oby on- ona onb onn ono ont ony oo- ooa oob oon ooo oot ot- ota otb otn oto ott oya oyo taa tab tan tao tat tay tba tbb tbn tbo tbt tna tnb tnn tno tnt to- toa tob ton too tot toy tta ttb ttn tto ttt tty tya tyn tyo tyt yaa yab yan yao yat yay yby yna ynn yny yob yon yoo yot yoy yta ytn yto ytt yyb yyt yyy