a-a a-b a-t aaa aab aan aao aar aat aay ab- aba abb abn abo abr abt aby an- ana anb ann ano anr ant any aoa aob aon aoo aor aot ar- ara arb arn aro arr art ary at- ata atb atn ato atr att ay- aya ayn ayo ayr ayt baa bab ban bao bar bat bay bba bbb bbn bbo bbr bbt bby bna bnb bnn bno bnr bnt boa bob bon boo bor bot boy bra brb brn bro brr brt bry bta btb btn bto btr btt bty by- bya byn byo byr byt naa nab nan nao nar nat nay nba nbb nbn nbo nbr nbt nna nnb nnn nno nnt no- noa nob non noo nor not noy nra nrb nrn nro nrr nrt nry nta ntb ntn nto ntr ntt nya nyn nyo nyt nyy oaa oab oan oao oar oat ob- oba obb obn obo obr obt oby on- ona onb onn ono onr ont ony oo- ooa oob oon ooo oor oot or- ora orb orn oro orr ort ory ot- ota otb otn oto otr ott oya oyo ra- raa rab ran rao rar rat ray rba rbb rbn rbo rbr rbt rna rnb rnn rno rnr rnt rny roa rob ron roo ror rot roy rra rrb rrn rrr rrt rta rtb rtn rto rtr rtt rty ry- rya ryn ryo ryr ryy taa tab tan tao tar tat tay tba tbb tbn tbo tbr tbt tna tnb tnn tno tnr tnt to- toa tob ton too tor tot toy tra trb trn tro trr trt try tta ttb ttn tto ttr ttt tty tya tyn tyo tyr tyt yaa yab yan yao yar yat yay ybr yby yna ynn yny yob yon yoo yor yot yoy yra yrn yro yrt yta ytn yto ytr ytt yyb yyt yyy