-er eee eem een eer eet eex em- eme emm emn emr emt emx en- ene enm enn enr ent ere erm ern err ert ete etm etn etr ett etx ex- exe exr ext exx m-r mee mem men mer met mex mme mmm mmn mmr mmt mmx mne mnm mnn mnr mnt mre mrm mrn mrr mrt mrx mte mtm mtn mtr mtt mtx mxn mxr ne- nee nem nen ner net nex nme nmm nmn nmr nmt nne nnm nnn nnt nre nrm nrn nrr nrt nrx nte ntm ntn ntr ntt ntx nxt re- ree rem ren rer ret rex rme rmm rmn rmr rmt rmx rnm rnn rnr rnt rrm rrn rrr rrt rte rtm rtn rtr rtt rtx rxr t-x te- tee tem ten ter tet tex tme tmm tmn tmr tmt tmx tne tnm tnn tnr tnt tnx tre trm trn trr trt trx tte ttm ttn ttr ttt ttx txe txn txt xee xem xen xer xet xex xmm xmr xmt xmx xrt xrx xtm xtr xtx xxx