a-a a-b aaa aab aah aao aar aay ab- aba abb abh abo abr aby aha ahb ahh aho ahr ahy aoa aob aoh aoo aor ar- ara arb arh aro arr ary ay- aya ayh ayo ayr baa bab bah bao bar bay bba bbb bbh bbo bbr bby bha bhb bhh bho bhr boa bob boh boo bor boy bra brb brh bro brr bry by- bya byh byo byr haa hab hah hao har hay hba hbb hbh hbo hbr hby hha hhb hhh hho hhr hhy hoa hob hoh hoo hor hoy hr- hra hrb hrh hro hrr hy- hya hyb hyh hyo hyr hyy oaa oab oah oao oar ob- oba obb obh obo obr oby oha ohh oho ohr oo- ooa oob ooh ooo oor or- ora orb orh oro orr ory oya oyo ra- raa rab rah rao rar ray rba rbb rbh rbo rbr rh- rha rhb rhh rho rhr roa rob roh roo ror roy rra rrb rrh rrr ry- rya ryo ryr ryy yaa yab yah yao yar yay ybr yby yha yob yoo yor yoy yra yro yyb yyy