a-a a-b aaa aab aan aao aar aau aay ab- aba abb abn abo abr abu aby an- ana anb ann ano anr anu any aoa aob aon aoo aor aou ar- ara arb arn aro arr aru ary au- aua aub aun auo aur ay- aya ayn ayo ayr ayu b-u baa bab ban bao bar bau bay bba bbb bbn bbo bbr bbu bby bna bnb bnn bno bnr bnu boa bob bon boo bor bou boy bra brb brn bro brr bru bry bua bub bun buo bur buu buy by- bya byn byo byr byu naa nab nan nao nar nau nay nba nbb nbn nbo nbr nbu nna nnb nnn nno nnu no- noa nob non noo nor nou noy nra nrb nrn nro nrr nru nry nua nub nun nuo nur nuu nuy nya nyn nyo nyu nyy oaa oab oan oao oar oau ob- oba obb obn obo obr obu oby on- ona onb onn ono onr onu ony oo- ooa oob oon ooo oor or- ora orb orn oro orr oru ory ou- oua oun ouo our oya oyo ra- raa rab ran rao rar rau ray rba rbb rbn rbo rbr rbu rna rnb rnn rno rnr rnu rny roa rob ron roo ror rou roy rra rrb rrn rrr rru rua rub run ruo rur ruu ruy ry- rya ryn ryo ryr ryu ryy ua- uaa uab uan uao uar uau uay uba ubb ubn ubo ubr ubu uby un- una unb unn uno unr unu uny uoa uob uon uoo uor ur- ura urb urn uro urr uru ury uua uun uur uuu uyo uyu yaa yab yan yao yar yau yay ybr yby yna ynn ynu yny yob yon yoo yor you yoy yra yrn yro yru yua yun yuo yur yuu yuy yyb yyu yyy