-er -ic c-- ccc ccd cce cci cco ccr ccs cdc cdd cde cdi cdo cdr cds ce- cec ced cee cei ceo cer ces ci- cic cid cie cii cio cir cis co- coc cod coe coi coo cor cos crc crd cre cri cro crr crs csc csd cse csi cso csr css dcc dcd dce dci dco dcr dcs ddc ddd dde ddi ddo ddr dds de- dec ded dee dei deo der des di- dic did die dii dio dir dis doc dod doe doi doo dor dos drc drd dre dri dro drr drs dsc dsd dse dsi dso dsr dss ec- ecc ecd ece eci eco ecr ecs ed- edc edd ede edi edo edr eds eec eed eee eeo eer ees eic eid eie eii eio eir eis eo- eoc eod eoe eoi eoo eor eos erc erd ere eri ero err ers es- esc esd ese esi eso esr ess i-d icc icd ice ici ico icr ics idc idd ide idi ido idr ids ie- iec ied iee iei ier ies iic iid iie iii iio iir iis io- ioc iod ioe ioi ioo ior ios ir- irc ird ire iri iro irr irs is- isc isd ise isi iso isr iss o-i oc- occ ocd oci oco ocr ocs odc odd ode odi odo odr ods oec oed oee oei oeo oer oes oic oid oie oii oio oir ois oo- ooc ood ooi ooo oor oos or- orc ord ore ori oro orr ors os- osc osd ose osi oso osr oss rcc rcd rce rci rco rcr rcs rdc rdd rde rdi rdo rdr rds re- rec red ree rei reo rer res ric rid rie rii rio rir ris roc rod roe roi roo ror ros rrc rrd rri rrr rrs rsc rsd rse rsi rso rsr rss scc scd sce sci sco scr scs sdc sdd sde sdi sdo sdr sds se- sec sed see sei seo ser ses sic sid sie sii sio sir sis soc sod soe soi soo sor sos sr- src srd sre sri sro srr srs ss- ssc ssd sse ssi sso ssr sss