a-a a-b aaa aab aag aam aao aar ab- aba abb abg abm abo abr ag- aga agb agg agm ago agr ama amb amg amm amo amr aoa aob aog aom aoo aor ar- ara arb arg arm aro arr baa bab bag bam bao bar bba bbb bbg bbm bbo bbr bga bgb bgg bgm bgo bgr bma bmb bmg bmm bmo bmr boa bob bog bom boo bor bra brb brg brm bro brr gaa gab gag gam gao gar gba gbg gbm gbo gbr gga ggb ggg ggm ggo ggr gma gmb gmg gmm gmo gmr goa gob gog gom goo gor gra grb grg grm gro grr m-o m-r maa mab mag mam mao mar mba mbb mbg mbm mbo mbr mga mgb mgm mgo mgr mma mmb mmg mmm mmo mmr moa mob mog mom moo mor mra mrb mrg mrm mro mrr oaa oab oag oam oao oar ob- oba obb obg obm obo obr oga ogg ogo om- oma omb omg omm omo omr oo- ooa oob oog oom ooo oor or- ora orb org orm oro orr ra- raa rab rag ram rao rar rba rbb rbg rbm rbo rbr rga rgb rgg rgo rgr rma rmb rmg rmm rmo rmr roa rob rog rom roo ror rra rrb rrg rrm rrr