a-a a-b aaa aab aah aar aay ab- aba abb abh abr aby aha ahb ahh ahr ahy ar- ara arb arh arr ary ay- aya ayh ayr baa bab bah bar bay bba bbb bbh bbr bby bha bhb bhh bhr bra brb brh brr bry by- bya byh byr haa hab hah har hay hba hbb hbh hbr hby hha hhb hhh hhr hhy hr- hra hrb hrh hrr hy- hya hyb hyh hyr hyy ra- raa rab rah rar ray rba rbb rbh rbr rh- rha rhb rhh rhr rra rrb rrh rrr ry- rya ryr ryy yaa yab yah yar yay ybr yby yha yra yyb yyy