-er c-- ccc ccd cce ccl ccr ccs cct cdc cdd cde cdl cdr cds cdt ce- cec ced cee cel cer ces cet cl- clc cld cle cll clr cls clt crc crd cre crl crr crs crt csc csd cse csl csr css cst ctc ctd cte ctl ctr cts ctt dcc dcd dce dcl dcr dcs dct ddc ddd dde ddl ddr dds ddt de- dec ded dee del der des det dl- dlc dld dle dll dlr dls dlt drc drd dre drl drr drs drt dsc dsd dse dsl dsr dss dst dtc dtd dte dtl dtr dts dtt ec- ecc ecd ece ecl ecr ecs ect ed- edc edd ede edl edr eds edt eec eed eee eel eer ees eet elc eld ele ell elr els elt erc erd ere erl err ers ert es- esc esd ese esl esr ess est etc etd ete etl etr ets ett lcc lcd lce lcl lcr lcs lct ldc ldd lde ldl ldr lds ldt lec led lee lel ler les let llc lld lle lll llr lls llt lrc lrd lrr lrs lrt lsc lsd lse lsl lsr lss lst ltc ltd lte ltl ltr lts ltt rcc rcd rce rcl rcr rcs rct rdc rdd rde rdl rdr rds rdt re- rec red ree rel rer res ret rlc rld rle rll rlr rls rlt rrc rrd rrl rrr rrs rrt rsc rsd rse rsl rsr rss rst rtc rtd rte rtl rtr rts rtt scc scd sce scl scr scs sct sdc sdd sde sdl sdr sds sdt se- sec sed see sel ser ses set slc sld sle sll slr sls slt sr- src srd sre srl srr srs srt ss- ssc ssd sse ssl ssr sss sst stc std ste stl str sts stt tcc tcd tce tcl tcr tcs tct tdc tdd tde tdl tdr tds tdt te- tec ted tee tel ter tes tet tlc tld tle tll tlr tls tlt trc trd tre trl trr trs trt tsc tsd tse tsl tsr tss tst ttc ttd tte ttl ttr tts ttt