a-a a-b aaa aab aaj aan aao aar ab- aba abb abj abn abo abr aja ajb ajj ajn ajo ajr an- ana anb anj ann ano anr aoa aob aoj aon aoo aor ar- ara arb arj arn aro arr baa bab baj ban bao bar bba bbb bbn bbo bbr bja bjj bjn bjr bna bnb bnj bnn bno bnr boa bob boj bon boo bor bra brb brj brn bro brr jaa jab jaj jan jao jar jba jbj jbo jbr jja jjb jjj jjr jna jnj jnn jno jnr joa job joj jon joo jor jra jrb jrn jro jrr naa nab naj nan nao nar nba nbb nbn nbo nbr nja njn nna nnb nnn nno no- noa nob noj non noo nor nra nrb nrj nrn nro nrr oaa oab oaj oan oao oar ob- oba obb obj obn obo obr oja ojb ojo on- ona onb onj onn ono onr oo- ooa oob oon ooo oor or- ora orb orn oro orr ra- raa rab raj ran rao rar rba rbb rbn rbo rbr rja rjr rna rnb rnn rno rnr roa rob roj ron roo ror rra rrb rrn rrr