-er a-a a-b a-i a-t aaa aab aae aai aam aan aao aar aat ab- aba abb abe abi abm abn abo abr abt aea aeb aee aei aem aen aeo aer aet ai- aia aib aie aii aim ain aio air ait ama amb ame ami amm amn amo amr amt an- ana anb ane ani anm ann ano anr ant aoa aob aoe aoi aom aon aoo aor aot ar- ara arb are ari arm arn aro arr art at- ata atb ate ati atm atn ato atr att baa bab bae bai bam ban bao bar bat bba bbb bbe bbi bbm bbn bbo bbr bbt be- bea beb bee bei bem ben beo ber bet bi- bia bib bie bii bim bin bio bir bit bma bmb bme bmi bmm bmn bmo bmr bmt bna bnb bne bni bnn bno bnr bnt boa bob boe boi bom bon boo bor bot bra brb bre bri brm brn bro brr brt bta btb bte bti btm btn bto btr btt eaa eab eae eai eam ean eao ear eat eba ebb ebe ebi ebm ebn ebo ebr ebt eea eeb eee eem een eeo eer eet eia eib eie eii eim ein eio eir eit em- ema emb eme emi emm emn emo emr emt en- ena enb ene eni enm enn eno enr ent eo- eoa eob eoe eoi eom eon eoo eor eot era erb ere eri erm ern ero err ert eta etb ete eti etm etn eto etr ett ia- iaa iab iae iai iam ian iao iar iat iba ibb ibe ibi ibm ibn ibo ibr ibt ie- iea iee iei iem ien ier iet iia iib iie iii iim iin iio iir iit im- ima imb ime imi imm imn imo imt in- ina inb ine ini inm inn ino inr int io- ioa iob ioe ioi iom ion ioo ior iot ir- ira irb ire iri irm irn iro irr irt ita itb ite iti itm itn ito itt m-o m-r maa mab mae mai mam man mao mar mat mba mbb mbe mbi mbm mbo mbr mbt mea meb mee mei mem men meo mer met mi- mia mib mie mii mim min mio mir mit mma mmb mme mmi mmm mmn mmo mmr mmt mna mnb mne mni mnm mnn mno mnr mnt moa mob moe moi mom mon moo mor mot mra mrb mre mri mrm mrn mro mrr mrt mta mtb mte mti mtm mtn mto mtr mtt n-i naa nab nae nai nam nan nao nar nat nba nbb nbe nbi nbm nbn nbo nbr nbt ne- nea neb nee nei nem nen neo ner net nia nib nie nii nim nin nio nir nit nma nmb nme nmi nmm nmn nmo nmr nmt nna nnb nne nni nnm nnn nno nnt no- noa nob noe noi nom non noo nor not nra nrb nre nri nrm nrn nro nrr nrt nta ntb nte nti ntm ntn nto ntr ntt o-i oaa oab oae oai oam oan oao oar oat ob- oba obb obe obi obm obn obo obr obt oea oeb oee oei oem oen oeo oer oet oia oib oie oii oim oin oio oir oit om- oma omb ome omi omm omn omo omr omt on- ona onb one oni onn ono onr ont oo- ooa oob ooi oom oon ooo oor oot or- ora orb ore ori orm orn oro orr ort ot- ota otb ote oti otm otn oto otr ott ra- raa rab rae rai ram ran rao rar rat rba rbb rbe rbi rbm rbn rbo rbr rbt re- rea reb ree rei rem ren reo rer ret ria rib rie rii rim rin rio rir rit rma rmb rme rmi rmm rmn rmo rmr rmt rna rnb rni rnm rnn rno rnr rnt roa rob roe roi rom ron roo ror rot rra rrb rri rrm rrn rrr rrt rta rtb rte rti rtm rtn rto rtr rtt taa tab tae tai tam tan tao tar tat tba tbb tbe tbi tbm tbn tbo tbr tbt te- tea teb tee tei tem ten teo ter tet tia tib tie tii tim tin tio tir tit tma tmb tme tmi tmm tmn tmo tmr tmt tna tnb tne tni tnm tnn tno tnr tnt to- toa tob toe toi tom ton too tor tot tra trb tre tri trm trn tro trr trt tta ttb tte tti ttm ttn tto ttr ttt