-er a-a a-b a-i a-t aaa aab aae aaf aai aam aao aar aat ab- aba abb abe abf abi abm abo abr abt aea aeb aee aef aei aem aeo aer aet af- afa afb afe aff afi afm afo afr aft ai- aia aib aie aif aii aim aio air ait ama amb ame amf ami amm amo amr amt aoa aob aoe aof aoi aom aoo aor aot ar- ara arb are arf ari arm aro arr art at- ata atb ate atf ati atm ato atr att baa bab bae baf bai bam bao bar bat bba bbb bbe bbf bbi bbm bbo bbr bbt be- bea beb bee bef bei bem beo ber bet bfa bfb bfe bff bfi bfm bfo bfr bft bi- bia bib bie bif bii bim bio bir bit bma bmb bme bmf bmi bmm bmo bmr bmt boa bob boe bof boi bom boo bor bot bra brb bre brf bri brm bro brr brt bta btb bte btf bti btm bto btr btt eaa eab eae eaf eai eam eao ear eat eba ebb ebe ebf ebi ebm ebo ebr ebt eea eeb eee eef eem eeo eer eet ef- efa efb efe eff efi efm efo efr eft eia eib eie eif eii eim eio eir eit em- ema emb eme emf emi emm emo emr emt eo- eoa eob eoe eof eoi eom eoo eor eot era erb ere erf eri erm ero err ert eta etb ete etf eti etm eto etr ett faa fab fae faf fai fam fao far fat fba fbb fbe fbf fbi fbm fbo fbr fbt fea feb fee fef fei fem feo fer fet ffa ffe fff ffi ffm ffo ffr fft fia fib fie fif fii fim fir fit fma fmb fme fmf fmi fmm fmo fmr fmt foa fob foe fof foi fom foo for fot fra frb fre frf fri frm fro frr frt fta ftb fte ftf fti ftm fto ftr ftt i-f ia- iaa iab iae iaf iai iam iao iar iat iba ibb ibe ibf ibi ibm ibo ibr ibt ie- iea iee ief iei iem ier iet ifa ifb ife iff ifi ifm ifo ifr ift iia iib iie iif iii iim iio iir iit im- ima imb ime imf imi imm imo imt io- ioa iob ioe iof ioi iom ioo ior iot ir- ira irb ire irf iri irm iro irr irt ita itb ite itf iti itm ito itt m-f m-o m-r maa mab mae maf mai mam mao mar mat mba mbb mbe mbf mbi mbm mbo mbr mbt mea meb mee mef mei mem meo mer met mfa mfb mfe mff mfi mfm mfo mfr mft mi- mia mib mie mif mii mim mio mir mit mma mmb mme mmf mmi mmm mmo mmr mmt moa mob moe mof moi mom moo mor mot mra mrb mre mrf mri mrm mro mrr mrt mta mtb mte mtf mti mtm mto mtr mtt o-i oaa oab oae oaf oai oam oao oar oat ob- oba obb obe obf obi obm obo obr obt oea oeb oee oef oei oem oeo oer oet of- ofa ofb ofe off ofi ofm ofo ofr oft oia oib oie oif oii oim oio oir oit om- oma omb ome omf omi omm omo omr omt oo- ooa oob oof ooi oom ooo oor oot or- ora orb ore orf ori orm oro orr ort ot- ota otb ote otf oti otm oto otr ott ra- raa rab rae raf rai ram rao rar rat rba rbb rbe rbf rbi rbm rbo rbr rbt re- rea reb ree ref rei rem reo rer ret rfa rfb rfe rff rfi rfm rfo rfr rft ria rib rie rif rii rim rio rir rit rma rmb rme rmf rmi rmm rmo rmr rmt roa rob roe rof roi rom roo ror rot rra rrb rrf rri rrm rrr rrt rta rtb rte rtf rti rtm rto rtr rtt taa tab tae taf tai tam tao tar tat tba tbb tbe tbf tbi tbm tbo tbr tbt te- tea teb tee tef tei tem teo ter tet tfa tfb tfe tff tfi tfm tfo tfr tft tia tib tie tif tii tim tio tir tit tma tmb tme tmf tmi tmm tmo tmr tmt to- toa tob toe tof toi tom too tor tot tra trb tre trf tri trm tro trr trt tta ttb tte ttf tti ttm tto ttr ttt