a-a a-b aaa aab aan aar aau aax aay ab- aba abb abn abr abu abx aby an- ana anb ann anr anu anx any ar- ara arb arn arr aru arx ary au- aua aub aun aur aux ax- axa axn axr axx ay- aya ayn ayr ayu ayx b-u baa bab ban bar bau bax bay bba bbb bbn bbr bbu bbx bby bna bnb bnn bnr bnu bnx bra brb brn brr bru brx bry bua bub bun bur buu bux buy bxb bxn bxx by- bya byn byr byu naa nab nan nar nau nax nay nba nbb nbn nbr nbu nbx nna nnb nnn nnu nra nrb nrn nrr nru nrx nry nua nub nun nur nuu nux nuy nya nyn nyu nyx nyy ra- raa rab ran rar rau rax ray rba rbb rbn rbr rbu rbx rna rnb rnn rnr rnu rny rra rrb rrn rrr rru rua rub run rur ruu rux ruy rxr ry- rya ryn ryr ryu ryy ua- uaa uab uan uar uau uay uba ubb ubn ubr ubu ubx uby un- una unb unn unr unu unx uny ur- ura urb urn urr uru urx ury uua uun uur uuu uxb uxr uxu uyu xaa xan xar xau xbr xbx xna xnu xrx xry xun xxx xxy xyr xyy yaa yab yan yar yau yax yay ybr yby yna ynn ynu yny yra yrn yru yua yun yur yuu yux yuy yxa yxy yyb yyu yyy