a-a a-b aaa aab aag aaj aao aar ab- aba abb abg abj abo abr ag- aga agb agg agj ago agr aja ajb ajj ajo ajr aoa aob aog aoj aoo aor ar- ara arb arg arj aro arr baa bab bag baj bao bar bba bbb bbg bbo bbr bga bgb bgg bgo bgr bja bjg bjj bjr boa bob bog boj boo bor bra brb brg brj bro brr gaa gab gag gaj gao gar gba gbg gbj gbo gbr gga ggb ggg ggj ggo ggr gja gjg gjr goa gob gog goo gor gra grb grg grj gro grr jaa jab jag jaj jao jar jba jbg jbj jbo jbr jga jgb jgo jgr jja jjb jjg jjj jjr joa job jog joj joo jor jra jrb jrg jro jrr oaa oab oag oaj oao oar ob- oba obb obg obj obo obr oga ogg ogo oja ojb ojo oo- ooa oob oog ooo oor or- ora orb org oro orr ra- raa rab rag raj rao rar rba rbb rbg rbo rbr rga rgb rgg rgo rgr rja rjg rjr roa rob rog roj roo ror rra rrb rrg rrr