a-a a-b a-c aaa aab aac aan aao aar aau aay ab- aba abb abc abn abo abr abu aby ac- aca acb acc acn aco acr acu acy an- ana anb anc ann ano anr anu any aoa aob aoc aon aoo aor aou ar- ara arb arc arn aro arr aru ary au- aua aub auc aun auo aur ay- aya ayc ayn ayo ayr ayu b-u baa bab bac ban bao bar bau bay bba bbb bbc bbn bbo bbr bbu bby bca bcb bcc bcn bco bcr bcu bcy bna bnb bnc bnn bno bnr bnu boa bob boc bon boo bor bou boy bra brb brn bro brr bru bry bua bub buc bun buo bur buu buy by- bya byc byn byo byr byu c-- caa cab cac can cao car cau cay cba cbb cbc cbn cbo cbr cbu cby cca ccb ccc ccn cco ccr ccu cn- cna cnb cnc cnn cno cnr cnu cny co- coa cob coc con coo cor cou coy cra crb crc crn cro crr cru cry cua cub cuc cun cuo cur cuu cuy cya cyb cyc cyn cyo cyr naa nab nac nan nao nar nau nay nba nbb nbc nbn nbo nbr nbu nca ncb ncc ncn nco ncr ncu nna nnb nnc nnn nno nnu no- noa nob noc non noo nor nou noy nra nrb nrc nrn nro nrr nru nry nua nub nuc nun nuo nur nuu nuy nya nyc nyn nyo nyu nyy oaa oab oac oan oao oar oau ob- oba obb obc obn obo obr obu oby oc- oca ocb occ ocn oco ocr ocu on- ona onb onc onn ono onr onu ony oo- ooa oob ooc oon ooo oor or- ora orb orc orn oro orr oru ory ou- oua ouc oun ouo our oya oyo ra- raa rab rac ran rao rar rau ray rba rbb rbc rbn rbo rbr rbu rca rcb rcc rcn rco rcr rcu rna rnb rnc rnn rno rnr rnu rny roa rob roc ron roo ror rou roy rra rrb rrc rrn rrr rru rua rub ruc run ruo rur ruu ruy ry- rya ryc ryn ryo ryr ryu ryy ua- uaa uab uac uan uao uar uau uay uba ubb ubc ubn ubo ubr ubu uby uca ucb ucc ucn uco ucr ucu un- una unb unc unn uno unr unu uny uoa uob uoc uon uoo uor ur- ura urb urc urn uro urr uru ury uua uuc uun uur uuu uyc uyo uyu yaa yab yac yan yao yar yau yay ybc ybr yby yca ycc yco ycu ycy yna ynn ynu yny yob yoc yon yoo yor you yoy yra yrc yrn yro yru yua yun yuo yur yuu yuy yyb yyc yyu yyy