-er -ic c-- ccc ccd cce ccg cci ccr ccs cdc cdd cde cdg cdi cdr cds ce- cec ced cee ceg cei cer ces cgc cgd cge cgg cgi cgr cgs ci- cic cid cie cig cii cir cis crc crd cre crg cri crr crs csc csd cse csg csi csr css dcc dcd dce dcg dci dcr dcs ddc ddd dde ddg ddi ddr dds de- dec ded dee deg dei der des dgc dgd dge dgg dgi dgr dgs di- dic did die dig dii dir dis drc drd dre drg dri drr drs dsc dsd dse dsg dsi dsr dss ec- ecc ecd ece ecg eci ecr ecs ed- edc edd ede edg edi edr eds eec eed eee eeg eer ees egc egd ege egg egi egr egs eic eid eie eig eii eir eis erc erd ere erg eri err ers es- esc esd ese esg esi esr ess g-d gcc gcd gce gcg gci gcr gcs gdc gdd gde gdi gdr gds ge- gec ged gee geg gei ger ges ggc ggd ggg ggi ggr ggs gic gid gie gig gii gir gis grc grd gre grg gri grr grs gsc gsd gse gsg gsi gsr gss i-d icc icd ice icg ici icr ics idc idd ide idg idi idr ids ie- iec ied iee ieg iei ier ies igc igd ige igg igi igr igs iic iid iie iii iir iis ir- irc ird ire irg iri irr irs is- isc isd ise isg isi isr iss rcc rcd rce rcg rci rcr rcs rdc rdd rde rdg rdi rdr rds re- rec red ree reg rei rer res rgc rgd rge rgg rgi rgr rgs ric rid rie rig rii rir ris rrc rrd rrg rri rrr rrs rsc rsd rse rsg rsi rsr rss scc scd sce scg sci scr scs sdc sdd sde sdg sdi sdr sds se- sec sed see seg sei ser ses sgc sgd sge sgg sgi sgr sgs sic sid sie sig sii sir sis sr- src srd sre srg sri srr srs ss- ssc ssd sse ssg ssi ssr sss