-er ddd dde ddl ddr dds ddt de- ded dee del der des det dl- dld dle dll dlr dls dlt drd dre drl drr drs drt dsd dse dsl dsr dss dst dtd dte dtl dtr dts dtt ed- edd ede edl edr eds edt eed eee eel eer ees eet eld ele ell elr els elt erd ere erl err ers ert es- esd ese esl esr ess est etd ete etl etr ets ett ldd lde ldl ldr lds ldt led lee lel ler les let lld lle lll llr lls llt lrd lrr lrs lrt lsd lse lsl lsr lss lst ltd lte ltl ltr lts ltt rdd rde rdl rdr rds rdt re- red ree rel rer res ret rld rle rll rlr rls rlt rrd rrl rrr rrs rrt rsd rse rsl rsr rss rst rtd rte rtl rtr rts rtt sdd sde sdl sdr sds sdt se- sed see sel ser ses set sld sle sll slr sls slt sr- srd sre srl srr srs srt ss- ssd sse ssl ssr sss sst std ste stl str sts stt tdd tde tdl tdr tds tdt te- ted tee tel ter tes tet tld tle tll tlr tls tlt trd tre trl trr trs trt tsd tse tsl tsr tss tst ttd tte ttl ttr tts ttt