a-a a-b aaa aab aag aam aan aao aar ab- aba abb abg abm abn abo abr ag- aga agb agg agm agn ago agr ama amb amg amm amn amo amr an- ana anb ang anm ann ano anr aoa aob aog aom aon aoo aor ar- ara arb arg arm arn aro arr baa bab bag bam ban bao bar bba bbb bbg bbm bbn bbo bbr bga bgb bgg bgm bgn bgo bgr bma bmb bmg bmm bmn bmo bmr bna bnb bng bnn bno bnr boa bob bog bom bon boo bor bra brb brg brm brn bro brr gaa gab gag gam gan gao gar gba gbg gbm gbn gbo gbr gga ggb ggg ggm ggn ggo ggr gma gmb gmg gmm gmn gmo gmr gna gnb gnm gnn gno gnr goa gob gog gom gon goo gor gra grb grg grm grn gro grr m-o m-r maa mab mag mam man mao mar mba mbb mbg mbm mbo mbr mga mgb mgm mgn mgo mgr mma mmb mmg mmm mmn mmo mmr mna mnb mng mnm mnn mno mnr moa mob mog mom mon moo mor mra mrb mrg mrm mrn mro mrr naa nab nag nam nan nao nar nba nbb nbg nbm nbn nbo nbr nga ngb ngg ngm ngn ngo nma nmb nmg nmm nmn nmo nmr nna nnb nng nnm nnn nno no- noa nob nog nom non noo nor nra nrb nrg nrm nrn nro nrr oaa oab oag oam oan oao oar ob- oba obb obg obm obn obo obr oga ogg ogn ogo om- oma omb omg omm omn omo omr on- ona onb ong onn ono onr oo- ooa oob oog oom oon ooo oor or- ora orb org orm orn oro orr ra- raa rab rag ram ran rao rar rba rbb rbg rbm rbn rbo rbr rga rgb rgg rgn rgo rgr rma rmb rmg rmm rmn rmo rmr rna rnb rng rnm rnn rno rnr roa rob rog rom ron roo ror rra rrb rrg rrm rrn rrr