-er eee eem een eep eer eet em- eme emm emn emp emr emt en- ene enm enn enp enr ent ep- epe epm epn epp epr ept ere erm ern erp err ert ete etm etn etp etr ett m-r mee mem men mep mer met mme mmm mmn mmp mmr mmt mne mnm mnn mnp mnr mnt mpe mpm mpn mpp mpr mpt mre mrm mrn mrp mrr mrt mte mtm mtn mtp mtr mtt ne- nee nem nen nep ner net nme nmm nmn nmp nmr nmt nne nnm nnn nnp nnt npe npm npn npp npr npt nre nrm nrn nrp nrr nrt nte ntm ntn ntp ntr ntt p-p pee pem pen pep per pet pme pmm pmn pmp pmr pmt pn- pne pnm pnn pnp pnr pnt ppe ppm ppn ppp ppr ppt pre prm prn prp prr prt pt- pte ptm ptn ptp ptr ptt re- ree rem ren rep rer ret rme rmm rmn rmp rmr rmt rnm rnn rnp rnr rnt rpe rpm rpn rpp rpr rpt rrm rrn rrp rrr rrt rte rtm rtn rtp rtr rtt te- tee tem ten tep ter tet tme tmm tmn tmp tmr tmt tne tnm tnn tnp tnr tnt tpe tpm tpn tpp tpr tpt tre trm trn trp trr trt tte ttm ttn ttp ttr ttt