a-a a-b a-c aaa aab aac aah aao aar aau aay ab- aba abb abc abh abo abr abu aby ac- aca acb acc ach aco acr acu acy aha ahb ahc ahh aho ahr ahu ahy aoa aob aoc aoh aoo aor aou ar- ara arb arc arh aro arr aru ary au- aua aub auc auh auo aur ay- aya ayc ayh ayo ayr ayu b-u baa bab bac bah bao bar bau bay bba bbb bbc bbh bbo bbr bbu bby bca bcb bcc bch bco bcr bcu bcy bha bhb bhc bhh bho bhr bhu boa bob boc boh boo bor bou boy bra brb brh bro brr bru bry bua bub buc buh buo bur buu buy by- bya byc byh byo byr byu c-- caa cab cac cah cao car cau cay cba cbb cbc cbh cbo cbr cbu cby cca ccb ccc cch cco ccr ccu ch- cha chb chc chh cho chr chu chy co- coa cob coc coh coo cor cou coy cra crb crc crh cro crr cru cry cua cub cuc cuh cuo cur cuu cuy cya cyb cyc cyo cyr haa hab hac hah hao har hau hay hba hbb hbc hbh hbo hbr hbu hby hca hcb hcc hch hco hcr hcy hha hhb hhc hhh hho hhr hhu hhy hoa hob hoc hoh hoo hor hou hoy hr- hra hrb hrc hrh hro hrr hru hua hub huc huh huo hur huu huy hy- hya hyb hyc hyh hyo hyr hyy oaa oab oac oah oao oar oau ob- oba obb obc obh obo obr obu oby oc- oca ocb occ och oco ocr ocu oha ohc ohh oho ohr ohu oo- ooa oob ooc ooh ooo oor or- ora orb orc orh oro orr oru ory ou- oua ouc ouh ouo our oya oyo ra- raa rab rac rah rao rar rau ray rba rbb rbc rbh rbo rbr rbu rca rcb rcc rch rco rcr rcu rh- rha rhb rhc rhh rho rhr rhu roa rob roc roh roo ror rou roy rra rrb rrc rrh rrr rru rua rub ruc ruh ruo rur ruu ruy ry- rya ryc ryo ryr ryu ryy ua- uaa uab uac uah uao uar uau uay uba ubb ubc ubh ubo ubr ubu uby uca ucb ucc uch uco ucr ucu uha uhb uhc uhh uho uhr uhu uhy uoa uob uoc uoo uor ur- ura urb urc uro urr uru ury uua uuc uur uuu uyc uyo uyu yaa yab yac yah yao yar yau yay ybc ybr yby yca ycc ych yco ycu ycy yha yhc yhu yob yoc yoo yor you yoy yra yrc yro yru yua yuh yuo yur yuu yuy yyb yyc yyu yyy