-er ddd dde ddi ddl ddp ddr ddx de- ded dee dei del dep der dex di- did die dii dil dip dir dix dl- dld dle dli dll dlp dlr dlx dpd dpe dpi dpl dpp dpr drd dre dri drl drp drr drx dxd dxi dxl dxp dxr dxx ed- edd ede edi edl edp edr edx eed eee eel eep eer eex eid eie eii eil eip eir eix eld ele eli ell elp elr elx ep- epd epe epi epl epp epr epx erd ere eri erl erp err ex- exd exe exi exl exp exr exx i-d idd ide idi idl idp idr idx ie- ied iee iei iel iep ier iex iid iie iii iil iip iir iix il- ild ile ili ill ilp ilr ilx ipd ipe ipi ipl ipp ipr ipx ir- ird ire iri irl irp irr irx ixe ixi ixl l-p ldd lde ldi ldl ldp ldr led lee lei lel lep ler lex lid lie lii lil lip lir lix lld lle lli lll llp llr lpd lpe lpi lpl lpp lpr lpx lrd lri lrp lrr lxd lxi lxr lxx p-p pdd pde pdi pdl pdp pdr pdx ped pee pei pel pep per pex pid pie pii pil pip pir pix pld ple pli pll plp plr plx ppd ppe ppi ppl ppp ppr ppx prd pre pri prl prp prr prx pxe pxl pxr rdd rde rdi rdl rdp rdr rdx re- red ree rei rel rep rer rex rid rie rii ril rip rir rix rld rle rli rll rlp rlr rpd rpe rpi rpl rpp rpr rpx rrd rri rrl rrp rrr rxp rxr xde xdi xdr xed xee xel xep xer xex xie xii xix xld xli xlr xpd xpe xpl xpp xrd xrx xxi xxl xxp xxx