-er ddd dde ddi ddk ddl ddp ddr dds de- ded dee dei dek del dep der des di- did die dii dik dil dip dir dis dke dki dkk dkl dkp dkr dks dl- dld dle dli dlk dll dlp dlr dls dpd dpe dpi dpk dpl dpp dpr dps drd dre dri drk drl drp drr drs dsd dse dsi dsk dsl dsp dsr dss ed- edd ede edi edk edl edp edr eds eed eee eek eel eep eer ees eid eie eii eik eil eip eir eis ekd eke eki ekl ekp ekr eks eld ele eli elk ell elp elr els ep- epd epe epi epl epp epr eps erd ere eri erk erl erp err ers es- esd ese esi esk esl esp esr ess i-d idd ide idi idk idl idp idr ids ie- ied iee iei iek iel iep ier ies iid iie iii iil iip iir iis ike iki ikk ikl ikr iks il- ild ile ili ilk ill ilp ilr ils ipd ipe ipi ipl ipp ipr ips ir- ird ire iri irk irl irp irr irs is- isd ise isi isk isl isp isr iss kde kdk kdl kdp kdr kds ke- ked kee kei kek kel kep ker kes kid kie kii kik kil kip kir kis kke kki kkk kkl kkp kkr kks kl- kld kli klr kls kpd kpe kpi kpk kpl kpp kpr kps krd kri krk krl krp krr krs ksd kse ksi ksk ksl ksp ksr kss l-p ldd lde ldi ldk ldl ldp ldr lds led lee lei lek lel lep ler les lid lie lii lik lil lip lir lis lkl lkp lkr lks lld lle lli llk lll llp llr lls lpd lpe lpi lpk lpl lpp lpr lps lrd lri lrk lrp lrr lrs lsd lse lsi lsk lsl lsp lsr lss p-p pdd pde pdi pdk pdl pdp pdr pds ped pee pei pek pel pep per pes pid pie pii pik pil pip pir pis pkd pke pki pkl pkp pkr pks pld ple pli plk pll plp plr pls ppd ppe ppi ppk ppl ppp ppr pps prd pre pri prk prl prp prr prs ps- psd pse psi psk psl psp psr pss rdd rde rdi rdl rdp rdr rds re- red ree rei rek rel rep rer res rid rie rii rik ril rip rir ris rke rkk rkp rks rld rle rli rll rlp rlr rls rpd rpe rpi rpk rpl rpp rpr rps rrd rri rrk rrl rrp rrr rrs rsd rse rsi rsk rsl rsp rsr rss sdd sde sdi sdk sdl sdp sdr sds se- sed see sei sek sel sep ser ses sid sie sii sik sil sip sir sis sk- skd ske ski skk skl skp skr sks sld sle sli slk sll slp slr sls spd spe spi spk spl spp spr sps sr- srd sre sri srk srl srp srr srs ss- ssd sse ssi ssk ssl ssp ssr sss