a-a a-b aaa aab aah aaj aao aar ab- aba abb abh abj abo abr aha ahb ahh ahj aho ahr aja ajb ajh ajj ajo ajr aoa aob aoh aoj aoo aor ar- ara arb arh arj aro arr baa bab bah baj bao bar bba bbb bbh bbo bbr bha bhb bhh bhj bho bhr bja bjj bjr boa bob boh boj boo bor bra brb brh brj bro brr haa hab hah haj hao har hba hbb hbh hbj hbo hbr hha hhb hhh hhj hho hhr hja hjo hjr hoa hob hoh hoo hor hr- hra hrb hrh hrj hro hrr jaa jab jah jaj jao jar jba jbj jbo jbr jha jhj jho jhr jja jjb jjj jjr joa job joh joj joo jor jra jrb jro jrr oaa oab oah oaj oao oar ob- oba obb obh obj obo obr oha ohh oho ohr oja ojb ojo oo- ooa oob ooh ooo oor or- ora orb orh oro orr ra- raa rab rah raj rao rar rba rbb rbh rbo rbr rh- rha rhb rhh rho rhr rja rjr roa rob roh roj roo ror rra rrb rrh rrr