a-a a-b aaa aab aag aaj aao ab- aba abb abg abj abo ag- aga agb agg agj ago aja ajb ajj ajo aoa aob aog aoj aoo baa bab bag baj bao bba bbb bbg bbo bga bgb bgg bgo bja bjg bjj boa bob bog boj boo gaa gab gag gaj gao gba gbg gbj gbo gga ggb ggg ggj ggo gja gjg goa gob gog goo jaa jab jag jaj jao jba jbg jbj jbo jga jgb jgo jja jjb jjg jjj joa job jog joj joo oaa oab oag oaj oao ob- oba obb obg obj obo oga ogg ogo oja ojb ojo oo- ooa oob oog ooo