a-a a-b a-c aaa aab aac aah aar aau aay ab- aba abb abc abh abr abu aby ac- aca acb acc ach acr acu acy aha ahb ahc ahh ahr ahu ahy ar- ara arb arc arh arr aru ary au- aua aub auc auh aur ay- aya ayc ayh ayr ayu b-u baa bab bac bah bar bau bay bba bbb bbc bbh bbr bbu bby bca bcb bcc bch bcr bcu bcy bha bhb bhc bhh bhr bhu bra brb brh brr bru bry bua bub buc buh bur buu buy by- bya byc byh byr byu c-- caa cab cac cah car cau cay cba cbb cbc cbh cbr cbu cby cca ccb ccc cch ccr ccu ch- cha chb chc chh chr chu chy cra crb crc crh crr cru cry cua cub cuc cuh cur cuu cuy cya cyb cyc cyr haa hab hac hah har hau hay hba hbb hbc hbh hbr hbu hby hca hcb hcc hch hcr hcy hha hhb hhc hhh hhr hhu hhy hr- hra hrb hrc hrh hrr hru hua hub huc huh hur huu huy hy- hya hyb hyc hyh hyr hyy ra- raa rab rac rah rar rau ray rba rbb rbc rbh rbr rbu rca rcb rcc rch rcr rcu rh- rha rhb rhc rhh rhr rhu rra rrb rrc rrh rrr rru rua rub ruc ruh rur ruu ruy ry- rya ryc ryr ryu ryy ua- uaa uab uac uah uar uau uay uba ubb ubc ubh ubr ubu uby uca ucb ucc uch ucr ucu uha uhb uhc uhh uhr uhu uhy ur- ura urb urc urr uru ury uua uuc uur uuu uyc uyu yaa yab yac yah yar yau yay ybc ybr yby yca ycc ych ycu ycy yha yhc yhu yra yrc yru yua yuh yur yuu yuy yyb yyc yyu yyy