c-- ccc ccd cce ccl ccs cdc cdd cde cdl cds ce- cec ced cee cel ces cl- clc cld cle cll cls csc csd cse csl css dcc dcd dce dcl dcs ddc ddd dde ddl dds de- dec ded dee del des dl- dlc dld dle dll dls dsc dsd dse dsl dss ec- ecc ecd ece ecl ecs ed- edc edd ede edl eds eec eed eee eel ees elc eld ele ell els es- esc esd ese esl ess lcc lcd lce lcl lcs ldc ldd lde ldl lds lec led lee lel les llc lld lle lll lls lsc lsd lse lsl lss scc scd sce scl scs sdc sdd sde sdl sds se- sec sed see sel ses slc sld sle sll sls ss- ssc ssd sse ssl sss