c-- ccc ccd cce ccl ccs cct cdc cdd cde cdl cds cdt ce- cec ced cee cel ces cet cl- clc cld cle cll cls clt csc csd cse csl css cst ctc ctd cte ctl cts ctt dcc dcd dce dcl dcs dct ddc ddd dde ddl dds ddt de- dec ded dee del des det dl- dlc dld dle dll dls dlt dsc dsd dse dsl dss dst dtc dtd dte dtl dts dtt ec- ecc ecd ece ecl ecs ect ed- edc edd ede edl eds edt eec eed eee eel ees eet elc eld ele ell els elt es- esc esd ese esl ess est etc etd ete etl ets ett lcc lcd lce lcl lcs lct ldc ldd lde ldl lds ldt lec led lee lel les let llc lld lle lll lls llt lsc lsd lse lsl lss lst ltc ltd lte ltl lts ltt scc scd sce scl scs sct sdc sdd sde sdl sds sdt se- sec sed see sel ses set slc sld sle sll sls slt ss- ssc ssd sse ssl sss sst stc std ste stl sts stt tcc tcd tce tcl tcs tct tdc tdd tde tdl tds tdt te- tec ted tee tel tes tet tlc tld tle tll tls tlt tsc tsd tse tsl tss tst ttc ttd tte ttl tts ttt