-er c-- ccc ccd cce ccn ccr ccs cdc cdd cde cdn cdr cds ce- cec ced cee cen cer ces cn- cnc cnd cne cnn cnr cns crc crd cre crn crr crs csc csd cse csn csr css dcc dcd dce dcn dcr dcs ddc ddd dde ddn ddr dds de- dec ded dee den der des dnc dnd dne dnn dnr dns drc drd dre drn drr drs dsc dsd dse dsn dsr dss ec- ecc ecd ece ecn ecr ecs ed- edc edd ede edn edr eds eec eed eee een eer ees en- enc end ene enn enr ens erc erd ere ern err ers es- esc esd ese esn esr ess ncc ncd nce ncn ncr ncs ndc ndd nde ndn ndr nds ne- nec ned nee nen ner nes nnc nne nnn nns nrc nrd nre nrn nrr nrs nsc nsd nse nsn nsr nss rcc rcd rce rcn rcr rcs rdc rdd rde rdn rdr rds re- rec red ree ren rer res rnc rnd rnn rnr rns rrc rrd rrn rrr rrs rsc rsd rse rsn rsr rss scc scd sce scn scr scs sdc sdd sde sdn sdr sds se- sec sed see sen ser ses snc snd sne snn snr sns sr- src srd sre srn srr srs ss- ssc ssd sse ssn ssr sss