-er a-a a-b a-t aaa aab aae aam aan aar aat aax ab- aba abb abe abm abn abr abt abx aea aeb aee aem aen aer aet aex ama amb ame amm amn amr amt amx an- ana anb ane anm ann anr ant anx ar- ara arb are arm arn arr art arx at- ata atb ate atm atn atr att atx ax- axa axe axm axn axr axt axx baa bab bae bam ban bar bat bax bba bbb bbe bbm bbn bbr bbt bbx be- bea beb bee bem ben ber bet bex bma bmb bme bmm bmn bmr bmt bmx bna bnb bne bnn bnr bnt bnx bra brb bre brm brn brr brt brx bta btb bte btm btn btr btt btx bxb bxm bxn bxx eaa eab eae eam ean ear eat eax eba ebb ebe ebm ebn ebr ebt ebx eea eeb eee eem een eer eet eex em- ema emb eme emm emn emr emt emx en- ena enb ene enm enn enr ent era erb ere erm ern err ert eta etb ete etm etn etr ett etx ex- exa exe exr ext exx m-r maa mab mae mam man mar mat max mba mbb mbe mbm mbr mbt mbx mea meb mee mem men mer met mex mma mmb mme mmm mmn mmr mmt mmx mna mnb mne mnm mnn mnr mnt mra mrb mre mrm mrn mrr mrt mrx mta mtb mte mtm mtn mtr mtt mtx mxa mxn mxr naa nab nae nam nan nar nat nax nba nbb nbe nbm nbn nbr nbt nbx ne- nea neb nee nem nen ner net nex nma nmb nme nmm nmn nmr nmt nna nnb nne nnm nnn nnt nra nrb nre nrm nrn nrr nrt nrx nta ntb nte ntm ntn ntr ntt ntx nxt ra- raa rab rae ram ran rar rat rax rba rbb rbe rbm rbn rbr rbt rbx re- rea reb ree rem ren rer ret rex rma rmb rme rmm rmn rmr rmt rmx rna rnb rnm rnn rnr rnt rra rrb rrm rrn rrr rrt rta rtb rte rtm rtn rtr rtt rtx rxr t-x taa tab tae tam tan tar tat tax tba tbb tbe tbm tbn tbr tbt te- tea teb tee tem ten ter tet tex tma tmb tme tmm tmn tmr tmt tmx tna tnb tne tnm tnn tnr tnt tnx tra trb tre trm trn trr trt trx tta ttb tte ttm ttn ttr ttt ttx txe txn txt xaa xam xan xar xat xbe xbr xbx xee xem xen xer xet xex xma xmm xmr xmt xmx xna xrt xrx xtm xtr xtx xxx