-er a-a a-b a-t aaa aab aae aaf aam aan aao aar aat ab- aba abb abe abf abm abn abo abr abt aea aeb aee aef aem aen aeo aer aet af- afa afb afe aff afm afn afo afr aft ama amb ame amf amm amn amo amr amt an- ana anb ane anf anm ann ano anr ant aoa aob aoe aof aom aon aoo aor aot ar- ara arb are arf arm arn aro arr art at- ata atb ate atf atm atn ato atr att baa bab bae baf bam ban bao bar bat bba bbb bbe bbf bbm bbn bbo bbr bbt be- bea beb bee bef bem ben beo ber bet bfa bfb bfe bff bfm bfn bfo bfr bft bma bmb bme bmf bmm bmn bmo bmr bmt bna bnb bne bnf bnn bno bnr bnt boa bob boe bof bom bon boo bor bot bra brb bre brf brm brn bro brr brt bta btb bte btf btm btn bto btr btt eaa eab eae eaf eam ean eao ear eat eba ebb ebe ebf ebm ebn ebo ebr ebt eea eeb eee eef eem een eeo eer eet ef- efa efb efe eff efm efo efr eft em- ema emb eme emf emm emn emo emr emt en- ena enb ene enf enm enn eno enr ent eo- eoa eob eoe eof eom eon eoo eor eot era erb ere erf erm ern ero err ert eta etb ete etf etm etn eto etr ett faa fab fae faf fam fan fao far fat fba fbb fbe fbf fbm fbn fbo fbr fbt fea feb fee fef fem fen feo fer fet ffa ffe fff ffm ffn ffo ffr fft fma fmb fme fmf fmm fmn fmo fmr fmt fna fnb fne fnf fnm fnn fnr fnt foa fob foe fof fom fon foo for fot fra frb fre frf frm frn fro frr frt fta ftb fte ftf ftm ftn fto ftr ftt m-f m-o m-r maa mab mae maf mam man mao mar mat mba mbb mbe mbf mbm mbo mbr mbt mea meb mee mef mem men meo mer met mfa mfb mfe mff mfm mfn mfo mfr mft mma mmb mme mmf mmm mmn mmo mmr mmt mna mnb mne mnf mnm mnn mno mnr mnt moa mob moe mof mom mon moo mor mot mra mrb mre mrf mrm mrn mro mrr mrt mta mtb mte mtf mtm mtn mto mtr mtt naa nab nae naf nam nan nao nar nat nba nbb nbe nbf nbm nbn nbo nbr nbt ne- nea neb nee nef nem nen neo ner net nfa nfb nfe nff nfn nfo nfr nft nma nmb nme nmm nmn nmo nmr nmt nna nnb nne nnf nnm nnn nno nnt no- noa nob noe nof nom non noo nor not nra nrb nre nrf nrm nrn nro nrr nrt nta ntb nte ntf ntm ntn nto ntr ntt oaa oab oae oaf oam oan oao oar oat ob- oba obb obe obf obm obn obo obr obt oea oeb oee oef oem oen oeo oer oet of- ofa ofb ofe off ofm ofn ofo ofr oft om- oma omb ome omf omm omn omo omr omt on- ona onb one onf onn ono onr ont oo- ooa oob oof oom oon ooo oor oot or- ora orb ore orf orm orn oro orr ort ot- ota otb ote otf otm otn oto otr ott ra- raa rab rae raf ram ran rao rar rat rba rbb rbe rbf rbm rbn rbo rbr rbt re- rea reb ree ref rem ren reo rer ret rfa rfb rfe rff rfm rfn rfo rfr rft rma rmb rme rmf rmm rmn rmo rmr rmt rna rnb rnm rnn rno rnr rnt roa rob roe rof rom ron roo ror rot rra rrb rrf rrm rrn rrr rrt rta rtb rte rtf rtm rtn rto rtr rtt taa tab tae taf tam tan tao tar tat tba tbb tbe tbf tbm tbn tbo tbr tbt te- tea teb tee tef tem ten teo ter tet tfa tfb tfe tff tfm tfn tfo tfr tft tma tmb tme tmf tmm tmn tmo tmr tmt tna tnb tne tnf tnm tnn tno tnr tnt to- toa tob toe tof tom ton too tor tot tra trb tre trf trm trn tro trr trt tta ttb tte ttf ttm ttn tto ttr ttt