-er ddd dde ddi ddl ddp ddr dds ddx de- ded dee dei del dep der des dex di- did die dii dil dip dir dis dix dl- dld dle dli dll dlp dlr dls dlx dpd dpe dpi dpl dpp dpr dps drd dre dri drl drp drr drs drx dsd dse dsi dsl dsp dsr dss dsx dxd dxi dxl dxp dxr dxs dxx ed- edd ede edi edl edp edr eds edx eed eee eel eep eer ees eex eid eie eii eil eip eir eis eix eld ele eli ell elp elr els elx ep- epd epe epi epl epp epr eps epx erd ere eri erl erp err ers es- esd ese esi esl esp esr ess esx ex- exd exe exi exl exp exr exs exx i-d idd ide idi idl idp idr ids idx ie- ied iee iei iel iep ier ies iex iid iie iii iil iip iir iis iix il- ild ile ili ill ilp ilr ils ilx ipd ipe ipi ipl ipp ipr ips ipx ir- ird ire iri irl irp irr irs irx is- isd ise isi isl isp isr iss ixe ixi ixl l-p ldd lde ldi ldl ldp ldr lds led lee lei lel lep ler les lex lid lie lii lil lip lir lis lix lld lle lli lll llp llr lls lpd lpe lpi lpl lpp lpr lps lpx lrd lri lrp lrr lrs lsd lse lsi lsl lsp lsr lss lxd lxi lxr lxx p-p pdd pde pdi pdl pdp pdr pds pdx ped pee pei pel pep per pes pex pid pie pii pil pip pir pis pix pld ple pli pll plp plr pls plx ppd ppe ppi ppl ppp ppr pps ppx prd pre pri prl prp prr prs prx ps- psd pse psi psl psp psr pss psx pxe pxl pxr pxs rdd rde rdi rdl rdp rdr rds rdx re- red ree rei rel rep rer res rex rid rie rii ril rip rir ris rix rld rle rli rll rlp rlr rls rpd rpe rpi rpl rpp rpr rps rpx rrd rri rrl rrp rrr rrs rsd rse rsi rsl rsp rsr rss rsx rxp rxr rxs sdd sde sdi sdl sdp sdr sds se- sed see sei sel sep ser ses sex sid sie sii sil sip sir sis six sld sle sli sll slp slr sls slx spd spe spi spl spp spr sps spx sr- srd sre sri srl srp srr srs srx ss- ssd sse ssi ssl ssp ssr sss ssx sxi sxl sxs xde xdi xdr xds xed xee xel xep xer xes xex xie xii xis xix xld xli xlr xls xpd xpe xpl xpp xps xrd xrx xsi xsl xsp xss xxi xxl xxp xxx