-er ddd dde ddi ddm ddo ddp ddr dds de- ded dee dei dem deo dep der des di- did die dii dim dio dip dir dis dmd dme dmi dmm dmo dmp dmr dms dod doe doi dom doo dop dor dos dpd dpe dpi dpm dpo dpp dpr dps drd dre dri drm dro drp drr drs dsd dse dsi dsm dso dsp dsr dss ed- edd ede edi edm edo edp edr eds eed eee eem eeo eep eer ees eid eie eii eim eio eip eir eis em- emd eme emi emm emo emp emr ems eo- eod eoe eoi eom eoo eop eor eos ep- epd epe epi epm epo epp epr eps erd ere eri erm ero erp err ers es- esd ese esi esm eso esp esr ess i-d idd ide idi idm ido idp idr ids ie- ied iee iei iem iep ier ies iid iie iii iim iio iip iir iis im- imd ime imi imm imo imp ims io- iod ioe ioi iom ioo iop ior ios ipd ipe ipi ipm ipo ipp ipr ips ir- ird ire iri irm iro irp irr irs is- isd ise isi ism iso isp isr iss m-o m-r mdd mde mdi mdm mdo mdp mdr mds med mee mei mem meo mep mer mes mi- mid mie mii mim mio mip mir mis mmd mme mmi mmm mmo mmp mmr mms mod moe moi mom moo mop mor mos mpd mpe mpi mpm mpo mpp mpr mps mrd mre mri mrm mro mrp mrr mrs msd mse msi msm mso msp msr mss o-i odd ode odi odm odo odp odr ods oed oee oei oem oeo oep oer oes oid oie oii oim oio oip oir ois om- omd ome omi omm omo omp omr oms oo- ood ooi oom ooo oop oor oos op- opd ope opi opm opo opp opr ops or- ord ore ori orm oro orp orr ors os- osd ose osi osm oso osp osr oss p-p pdd pde pdi pdm pdo pdp pdr pds ped pee pei pem peo pep per pes pid pie pii pim pio pip pir pis pmd pme pmi pmm pmo pmp pmr pms pod poe poi pom poo pop por pos ppd ppe ppi ppm ppo ppp ppr pps prd pre pri prm pro prp prr prs ps- psd pse psi psm pso psp psr pss rdd rde rdi rdm rdo rdp rdr rds re- red ree rei rem reo rep rer res rid rie rii rim rio rip rir ris rmd rme rmi rmm rmo rmp rmr rms rod roe roi rom roo rop ror ros rpd rpe rpi rpm rpo rpp rpr rps rrd rri rrm rrp rrr rrs rsd rse rsi rsm rso rsp rsr rss sdd sde sdi sdm sdo sdp sdr sds se- sed see sei sem seo sep ser ses sid sie sii sim sio sip sir sis smd sme smi smm smo smp smr sms sod soe soi som soo sop sor sos spd spe spi spm spo spp spr sps sr- srd sre sri srm sro srp srr srs ss- ssd sse ssi ssm sso ssp ssr sss