a-a a-b aaa aab aak aan aao aar aay ab- aba abb abk abn abo abr aby aka akb akk akn ako akr an- ana anb ank ann ano anr any aoa aob aok aon aoo aor ar- ara arb ark arn aro arr ary ay- aya ayk ayn ayo ayr baa bab bak ban bao bar bay bba bbb bbk bbn bbo bbr bby bka bkb bkk bkn bko bkr bna bnb bnk bnn bno bnr boa bob bok bon boo bor boy bra brb brk brn bro brr bry by- bya byk byn byo byr ka- kaa kab kak kan kao kar kay kba kbb kbk kbn kbo kbr kkb kkk kkn kkr kky kn- kna knk knn kno knr koa kob kok kon koo kor koy kra krk krn kro krr kry kya kyn kyo kyr naa nab nak nan nao nar nay nba nbb nbk nbn nbo nbr nka nkk nkn nko nkr nky nna nnb nnk nnn nno no- noa nob nok non noo nor noy nra nrb nrk nrn nro nrr nry nya nyk nyn nyo nyy oaa oab oak oan oao oar ob- oba obb obk obn obo obr oby oka okb okk oko okr on- ona onb onk onn ono onr ony oo- ooa oob ook oon ooo oor or- ora orb ork orn oro orr ory oya oyo ra- raa rab rak ran rao rar ray rba rbb rbk rbn rbo rbr rkb rkk rko rky rna rnb rnn rno rnr rny roa rob rok ron roo ror roy rra rrb rrk rrn rrr ry- rya ryk ryn ryo ryr ryy yaa yab yak yan yao yar yay ybr yby yka ykk ykn yna ynk ynn yny yob yok yon yoo yor yoy yra yrn yro yyb yyy