eee eem eep ees eet eie eii eim eip eis eit em- eme emi emm emp ems emt ep- epe epi epm epp eps ept es- ese esi esm esp ess est ete eti etm etp ets ett ie- iee iei iem iep ies iet iie iii iim iip iis iit im- ime imi imm imp ims imt ipe ipi ipm ipp ips ipt is- ise isi ism isp iss ist ite iti itm itp its itt mee mei mem mep mes met mi- mie mii mim mip mis mit mme mmi mmm mmp mms mmt mpe mpi mpm mpp mps mpt mse msi msm msp mss mst mte mti mtm mtp mts mtt p-p pee pei pem pep pes pet pie pii pim pip pis pit pme pmi pmm pmp pms pmt ppe ppi ppm ppp pps ppt ps- pse psi psm psp pss pst pt- pte pti ptm ptp pts ptt se- see sei sem sep ses set sie sii sim sip sis sit sme smi smm smp sms smt spe spi spm spp sps spt ss- sse ssi ssm ssp sss sst ste sti stm stp sts stt te- tee tei tem tep tes tet tie tii tim tip tis tit tme tmi tmm tmp tms tmt tpe tpi tpm tpp tps tpt tse tsi tsm tsp tss tst tte tti ttm ttp tts ttt