eee eem eeo ees eet em- eme emm emo ems emt eo- eoe eom eoo eos eot es- ese esm eso ess est ete etm eto ets ett m-o mee mem meo mes met mme mmm mmo mms mmt moe mom moo mos mot mse msm mso mss mst mte mtm mto mts mtt oee oem oeo oes oet om- ome omm omo oms omt oo- oom ooo oos oot os- ose osm oso oss ost ot- ote otm oto ots ott se- see sem seo ses set sme smm smo sms smt soe som soo sos sot ss- sse ssm sso sss sst ste stm sto sts stt te- tee tem teo tes tet tme tmm tmo tms tmt to- toe tom too tos tot tse tsm tso tss tst tte ttm tto tts ttt