-er ddd dde ddi ddm ddp ddr dds de- ded dee dei dem dep der des di- did die dii dim dip dir dis dmd dme dmi dmm dmp dmr dms dpd dpe dpi dpm dpp dpr dps drd dre dri drm drp drr drs dsd dse dsi dsm dsp dsr dss ed- edd ede edi edm edp edr eds eed eee eem eep eer ees eid eie eii eim eip eir eis em- emd eme emi emm emp emr ems ep- epd epe epi epm epp epr eps erd ere eri erm erp err ers es- esd ese esi esm esp esr ess i-d idd ide idi idm idp idr ids ie- ied iee iei iem iep ier ies iid iie iii iim iip iir iis im- imd ime imi imm imp ims ipd ipe ipi ipm ipp ipr ips ir- ird ire iri irm irp irr irs is- isd ise isi ism isp isr iss m-r mdd mde mdi mdm mdp mdr mds med mee mei mem mep mer mes mi- mid mie mii mim mip mir mis mmd mme mmi mmm mmp mmr mms mpd mpe mpi mpm mpp mpr mps mrd mre mri mrm mrp mrr mrs msd mse msi msm msp msr mss p-p pdd pde pdi pdm pdp pdr pds ped pee pei pem pep per pes pid pie pii pim pip pir pis pmd pme pmi pmm pmp pmr pms ppd ppe ppi ppm ppp ppr pps prd pre pri prm prp prr prs ps- psd pse psi psm psp psr pss rdd rde rdi rdm rdp rdr rds re- red ree rei rem rep rer res rid rie rii rim rip rir ris rmd rme rmi rmm rmp rmr rms rpd rpe rpi rpm rpp rpr rps rrd rri rrm rrp rrr rrs rsd rse rsi rsm rsp rsr rss sdd sde sdi sdm sdp sdr sds se- sed see sei sem sep ser ses sid sie sii sim sip sir sis smd sme smi smm smp smr sms spd spe spi spm spp spr sps sr- srd sre sri srm srp srr srs ss- ssd sse ssi ssm ssp ssr sss