-er ddd dde ddi ddk ddm ddp ddr dds de- ded dee dei dek dem dep der des di- did die dii dik dim dip dir dis dke dki dkk dkm dkp dkr dks dmd dme dmi dmk dmm dmp dmr dms dpd dpe dpi dpk dpm dpp dpr dps drd dre dri drk drm drp drr drs dsd dse dsi dsk dsm dsp dsr dss ed- edd ede edi edk edm edp edr eds eed eee eek eem eep eer ees eid eie eii eik eim eip eir eis ekd eke eki ekp ekr eks em- emd eme emi emk emm emp emr ems ep- epd epe epi epm epp epr eps erd ere eri erk erm erp err ers es- esd ese esi esk esm esp esr ess i-d idd ide idi idk idm idp idr ids ie- ied iee iei iek iem iep ier ies iid iie iii iim iip iir iis ike iki ikk ikr iks im- imd ime imi imm imp ims ipd ipe ipi ipm ipp ipr ips ir- ird ire iri irk irm irp irr irs is- isd ise isi isk ism isp isr iss kde kdk kdm kdp kdr kds ke- ked kee kei kek kem kep ker kes kid kie kii kik kim kip kir kis kke kki kkk kkm kkp kkr kks kmd kme kmi kmk kmm kmp kms kpd kpe kpi kpk kpm kpp kpr kps krd kri krk krp krr krs ksd kse ksi ksk ksm ksp ksr kss m-r mdd mde mdi mdk mdm mdp mdr mds med mee mei mek mem mep mer mes mi- mid mie mii mik mim mip mir mis mkd mke mkk mkm mkp mkr mks mmd mme mmi mmk mmm mmp mmr mms mpd mpe mpi mpk mpm mpp mpr mps mrd mre mri mrk mrm mrp mrr mrs msd mse msi msk msm msp msr mss p-p pdd pde pdi pdk pdm pdp pdr pds ped pee pei pek pem pep per pes pid pie pii pik pim pip pir pis pkd pke pki pkm pkp pkr pks pmd pme pmi pmk pmm pmp pmr pms ppd ppe ppi ppk ppm ppp ppr pps prd pre pri prk prm prp prr prs ps- psd pse psi psk psm psp psr pss rdd rde rdi rdm rdp rdr rds re- red ree rei rek rem rep rer res rid rie rii rik rim rip rir ris rke rkk rkm rkp rks rmd rme rmi rmm rmp rmr rms rpd rpe rpi rpk rpm rpp rpr rps rrd rri rrk rrm rrp rrr rrs rsd rse rsi rsk rsm rsp rsr rss sdd sde sdi sdk sdm sdp sdr sds se- sed see sei sek sem sep ser ses sid sie sii sik sim sip sir sis sk- skd ske ski skk skm skp skr sks smd sme smi smk smm smp smr sms spd spe spi spk spm spp spr sps sr- srd sre sri srk srm srp srr srs ss- ssd sse ssi ssk ssm ssp ssr sss