-er ddd dde ddi ddl ddp ddr dds de- ded dee dei del dep der des di- did die dii dil dip dir dis dl- dld dle dli dll dlp dlr dls dpd dpe dpi dpl dpp dpr dps drd dre dri drl drp drr drs dsd dse dsi dsl dsp dsr dss ed- edd ede edi edl edp edr eds eed eee eel eep eer ees eid eie eii eil eip eir eis eld ele eli ell elp elr els ep- epd epe epi epl epp epr eps erd ere eri erl erp err ers es- esd ese esi esl esp esr ess i-d idd ide idi idl idp idr ids ie- ied iee iei iel iep ier ies iid iie iii iil iip iir iis il- ild ile ili ill ilp ilr ils ipd ipe ipi ipl ipp ipr ips ir- ird ire iri irl irp irr irs is- isd ise isi isl isp isr iss l-p ldd lde ldi ldl ldp ldr lds led lee lei lel lep ler les lid lie lii lil lip lir lis lld lle lli lll llp llr lls lpd lpe lpi lpl lpp lpr lps lrd lri lrp lrr lrs lsd lse lsi lsl lsp lsr lss p-p pdd pde pdi pdl pdp pdr pds ped pee pei pel pep per pes pid pie pii pil pip pir pis pld ple pli pll plp plr pls ppd ppe ppi ppl ppp ppr pps prd pre pri prl prp prr prs ps- psd pse psi psl psp psr pss rdd rde rdi rdl rdp rdr rds re- red ree rei rel rep rer res rid rie rii ril rip rir ris rld rle rli rll rlp rlr rls rpd rpe rpi rpl rpp rpr rps rrd rri rrl rrp rrr rrs rsd rse rsi rsl rsp rsr rss sdd sde sdi sdl sdp sdr sds se- sed see sei sel sep ser ses sid sie sii sil sip sir sis sld sle sli sll slp slr sls spd spe spi spl spp spr sps sr- srd sre sri srl srp srr srs ss- ssd sse ssi ssl ssp ssr sss