a-a a-b a-i aaa aab aae aaf aag aai aam aao ab- aba abb abe abf abg abi abm abo aea aeb aee aef aeg aei aem aeo af- afa afb afe aff afg afi afm afo ag- aga agb age agf agg agi agm ago ai- aia aib aie aif aig aii aim aio ama amb ame amf amg ami amm amo aoa aob aoe aof aog aoi aom aoo baa bab bae baf bag bai bam bao bba bbb bbe bbf bbg bbi bbm bbo be- bea beb bee bef beg bei bem beo bfa bfb bfe bff bfg bfi bfm bfo bga bgb bge bgf bgg bgi bgm bgo bi- bia bib bie bif big bii bim bio bma bmb bme bmf bmg bmi bmm bmo boa bob boe bof bog boi bom boo eaa eab eae eaf eag eai eam eao eba ebb ebe ebf ebg ebi ebm ebo eea eeb eee eef eeg eem eeo ef- efa efb efe eff efg efi efm efo ega egb ege egf egg egi egm ego eia eib eie eif eig eii eim eio em- ema emb eme emf emg emi emm emo eo- eoa eob eoe eof eog eoi eom eoo faa fab fae faf fag fai fam fao fba fbb fbe fbf fbg fbi fbm fbo fea feb fee fef feg fei fem feo ffa ffe fff ffg ffi ffm ffo fga fgb fge fgf fgg fgi fgm fia fib fie fif fig fii fim fma fmb fme fmf fmg fmi fmm fmo foa fob foe fof fog foi fom foo gaa gab gae gaf gag gai gam gao gba gbe gbf gbg gbi gbm gbo ge- gea geb gee gef geg gei gem geo gfa gfb gfe gff gfi gfm gfo gga ggb ggg ggi ggm ggo gia gib gie gif gig gii gim gio gma gmb gme gmf gmg gmi gmm gmo goa gob goe gof gog goi gom goo i-f ia- iaa iab iae iaf iag iai iam iao iba ibb ibe ibf ibg ibi ibm ibo ie- iea iee ief ieg iei iem ifa ifb ife iff ifg ifi ifm ifo iga igb ige igf igg igi igm igo iia iib iie iif iii iim iio im- ima imb ime imf img imi imm imo io- ioa iob ioe iof iog ioi iom ioo m-f m-o maa mab mae maf mag mai mam mao mba mbb mbe mbf mbg mbi mbm mbo mea meb mee mef meg mei mem meo mfa mfb mfe mff mfg mfi mfm mfo mga mgb mge mgf mgi mgm mgo mi- mia mib mie mif mig mii mim mio mma mmb mme mmf mmg mmi mmm mmo moa mob moe mof mog moi mom moo o-i oaa oab oae oaf oag oai oam oao ob- oba obb obe obf obg obi obm obo oea oeb oee oef oeg oei oem oeo of- ofa ofb ofe off ofg ofi ofm ofo oga oge ogf ogg ogi ogo oia oib oie oif oii oim oio om- oma omb ome omf omg omi omm omo oo- ooa oob oof oog ooi oom ooo