-er ddd dde ddf ddl ddr dds de- ded dee def del der des dfd dfe dff dfl dfr dfs dl- dld dle dlf dll dlr dls drd dre drl drr drs dsd dse dsf dsl dsr dss ed- edd ede edf edl edr eds eed eee eef eel eer ees ef- efd efe eff efl efr efs eld ele elf ell elr els erd ere erf erl err ers es- esd ese esf esl esr ess fdd fde fdf fdl fdr fds fed fee fef fel fer fes ffd ffe fff ffl ffr ffs fld fle flf fll flr fls frd fre frf frl frr frs fsd fse fsf fsl fsr fss ldd lde ldf ldl ldr lds led lee lef lel ler les lfd lfe lff lfl lfr lfs lld lle llf lll llr lls lrd lrf lrr lrs lsd lse lsf lsl lsr lss rdd rde rdf rdl rdr rds re- red ree ref rel rer res rfd rfe rff rfl rfr rfs rld rle rlf rll rlr rls rrd rrf rrl rrr rrs rsd rse rsf rsl rsr rss sdd sde sdf sdl sdr sds se- sed see sef sel ser ses sfd sfe sff sfl sfr sfs sld sle slf sll slr sls sr- srd sre srf srl srr srs ss- ssd sse ssf ssl ssr sss