a-a a-b a-i aaa aab aaf aag aai aam aan aao aar ab- aba abb abf abg abi abm abn abo abr af- afa afb aff afg afi afm afn afo afr ag- aga agb agf agg agi agm agn ago agr ai- aia aib aif aig aii aim ain aio air ama amb amf amg ami amm amn amo amr an- ana anb anf ang ani anm ann ano anr aoa aob aof aog aoi aom aon aoo aor ar- ara arb arf arg ari arm arn aro arr baa bab baf bag bai bam ban bao bar bba bbb bbf bbg bbi bbm bbn bbo bbr bfa bfb bff bfg bfi bfm bfn bfo bfr bga bgb bgf bgg bgi bgm bgn bgo bgr bi- bia bib bif big bii bim bin bio bir bma bmb bmf bmg bmi bmm bmn bmo bmr bna bnb bnf bng bni bnn bno bnr boa bob bof bog boi bom bon boo bor bra brb brf brg bri brm brn bro brr faa fab faf fag fai fam fan fao far fba fbb fbf fbg fbi fbm fbn fbo fbr ffa fff ffg ffi ffm ffn ffo ffr fga fgb fgf fgg fgi fgm fgn fgr fia fib fif fig fii fim fin fir fma fmb fmf fmg fmi fmm fmn fmo fmr fna fnb fnf fng fni fnm fnn fnr foa fob fof fog foi fom fon foo for fra frb frf frg fri frm frn fro frr gaa gab gaf gag gai gam gan gao gar gba gbf gbg gbi gbm gbn gbo gbr gfa gfb gff gfi gfm gfo gfr gga ggb ggg ggi ggm ggn ggo ggr gia gib gif gig gii gim gin gio gir gma gmb gmf gmg gmi gmm gmn gmo gmr gna gnb gnf gni gnm gnn gno gnr goa gob gof gog goi gom gon goo gor gra grb grf grg gri grm grn gro grr i-f ia- iaa iab iaf iag iai iam ian iao iar iba ibb ibf ibg ibi ibm ibn ibo ibr ifa ifb iff ifg ifi ifm ifn ifo ifr iga igb igf igg igi igm ign igo igr iia iib iif iii iim iin iio iir im- ima imb imf img imi imm imn imo in- ina inb inf ing ini inm inn ino inr io- ioa iob iof iog ioi iom ion ioo ior ir- ira irb irf irg iri irm irn iro irr m-f m-o m-r maa mab maf mag mai mam man mao mar mba mbb mbf mbg mbi mbm mbo mbr mfa mfb mff mfg mfi mfm mfn mfo mfr mga mgb mgf mgi mgm mgn mgo mgr mi- mia mib mif mig mii mim min mio mir mma mmb mmf mmg mmi mmm mmn mmo mmr mna mnb mnf mng mni mnm mnn mno mnr moa mob mof mog moi mom mon moo mor mra mrb mrf mrg mri mrm mrn mro mrr n-i naa nab naf nag nai nam nan nao nar nba nbb nbf nbg nbi nbm nbn nbo nbr nfa nfb nff nfi nfn nfo nfr nga ngb ngf ngg ngi ngm ngn ngo nia nib nif nig nii nim nin nio nir nma nmb nmg nmi nmm nmn nmo nmr nna nnb nnf nng nni nnm nnn nno no- noa nob nof nog noi nom non noo nor nra nrb nrf nrg nri nrm nrn nro nrr o-i oaa oab oaf oag oai oam oan oao oar ob- oba obb obf obg obi obm obn obo obr of- ofa ofb off ofg ofi ofm ofn ofo ofr oga ogf ogg ogi ogn ogo oia oib oif oii oim oin oio oir om- oma omb omf omg omi omm omn omo omr on- ona onb onf ong oni onn ono onr oo- ooa oob oof oog ooi oom oon ooo oor or- ora orb orf org ori orm orn oro orr ra- raa rab raf rag rai ram ran rao rar rba rbb rbf rbg rbi rbm rbn rbo rbr rfa rfb rff rfg rfi rfm rfn rfo rfr rga rgb rgf rgg rgi rgn rgo rgr ria rib rif rig rii rim rin rio rir rma rmb rmf rmg rmi rmm rmn rmo rmr rna rnb rng rni rnm rnn rno rnr roa rob rof rog roi rom ron roo ror rra rrb rrf rrg rri rrm rrn rrr