-er eee eek eem eep eer eie eii eik eim eip eir eke eki ekp ekr em- eme emi emk emm emp emr ep- epe epi epm epp epr ere eri erk erm erp err ie- iee iei iek iem iep ier iie iii iim iip iir ike iki ikk ikr im- ime imi imm imp ipe ipi ipm ipp ipr ir- ire iri irk irm irp irr ke- kee kei kek kem kep ker kie kii kik kim kip kir kke kki kkk kkm kkp kkr kme kmi kmk kmm kmp kpe kpi kpk kpm kpp kpr kri krk krp krr m-r mee mei mek mem mep mer mi- mie mii mik mim mip mir mke mkk mkm mkp mkr mme mmi mmk mmm mmp mmr mpe mpi mpk mpm mpp mpr mre mri mrk mrm mrp mrr p-p pee pei pek pem pep per pie pii pik pim pip pir pke pki pkm pkp pkr pme pmi pmk pmm pmp pmr ppe ppi ppk ppm ppp ppr pre pri prk prm prp prr re- ree rei rek rem rep rer rie rii rik rim rip rir rke rkk rkm rkp rme rmi rmm rmp rmr rpe rpi rpk rpm rpp rpr rri rrk rrm rrp rrr