a-a a-b aaa aab aag aaj aan aao ab- aba abb abg abj abn abo ag- aga agb agg agj agn ago aja ajb ajj ajn ajo an- ana anb ang anj ann ano aoa aob aog aoj aon aoo baa bab bag baj ban bao bba bbb bbg bbn bbo bga bgb bgg bgn bgo bja bjg bjj bjn bna bnb bng bnj bnn bno boa bob bog boj bon boo gaa gab gag gaj gan gao gba gbg gbj gbn gbo gga ggb ggg ggj ggn ggo gja gjg gna gnb gnn gno goa gob gog gon goo jaa jab jag jaj jan jao jba jbg jbj jbo jga jgb jgn jgo jja jjb jjg jjj jna jng jnj jnn jno joa job jog joj jon joo naa nab nag naj nan nao nba nbb nbg nbn nbo nga ngb ngg ngj ngn ngo nja njn nna nnb nng nnn nno no- noa nob nog noj non noo oaa oab oag oaj oan oao ob- oba obb obg obj obn obo oga ogg ogn ogo oja ojb ojo on- ona onb ong onj onn ono oo- ooa oob oog oon ooo