a-a a-b aaa aab aae aag aam aao aax ab- aba abb abe abg abm abo abx aea aeb aee aeg aem aeo aex ag- aga agb age agg agm ago agx ama amb ame amg amm amo amx aoa aob aoe aog aom aoo aox ax- axa axe axm axo axx baa bab bae bag bam bao bax bba bbb bbe bbg bbm bbo bbx be- bea beb bee beg bem beo bex bga bgb bge bgg bgm bgo bgx bma bmb bme bmg bmm bmo bmx boa bob boe bog bom boo box bxb bxm bxo bxx eaa eab eae eag eam eao eax eba ebb ebe ebg ebm ebo ebx eea eeb eee eeg eem eeo eex ega egb ege egg egm ego egx em- ema emb eme emg emm emo emx eo- eoa eob eoe eog eom eoo ex- exa exe exo exx gaa gab gae gag gam gao gba gbe gbg gbm gbo gbx ge- gea geb gee geg gem geo gex gga ggb ggg ggm ggo gma gmb gme gmg gmm gmo gmx goa gob goe gog gom goo gox gxa m-o maa mab mae mag mam mao max mba mbb mbe mbg mbm mbo mbx mea meb mee meg mem meo mex mga mgb mge mgm mgo mgx mma mmb mme mmg mmm mmo mmx moa mob moe mog mom moo mox mxa oaa oab oae oag oam oao oax ob- oba obb obe obg obm obo obx oea oeb oee oeg oem oeo oex oga oge ogg ogo ogx om- oma omb ome omg omm omo omx oo- ooa oob oog oom ooo oox ox- oxa oxb oxo oxx xaa xag xam xbe xbx xee xeg xem xex xge xma xmg xmm xmo xmx xoa xog xom xoo xox xxo xxx