-er -ic c-- ccc ccd cce ccf cci cco ccr ccs cdc cdd cde cdf cdi cdo cdr cds ce- cec ced cee cef cei ceo cer ces cfc cfd cfe cff cfi cfo cfr cfs ci- cic cid cie cif cii cio cir cis co- coc cod coe cof coi coo cor cos crc crd cre crf cri cro crr crs csc csd cse csf csi cso csr css dcc dcd dce dcf dci dco dcr dcs ddc ddd dde ddf ddi ddo ddr dds de- dec ded dee def dei deo der des dfc dfd dfe dff dfi dfo dfr dfs di- dic did die dif dii dio dir dis doc dod doe dof doi doo dor dos drc drd dre dri dro drr drs dsc dsd dse dsf dsi dso dsr dss ec- ecc ecd ece ecf eci eco ecr ecs ed- edc edd ede edf edi edo edr eds eec eed eee eef eeo eer ees ef- efc efd efe eff efi efo efr efs eic eid eie eif eii eio eir eis eo- eoc eod eoe eof eoi eoo eor eos erc erd ere erf eri ero err ers es- esc esd ese esf esi eso esr ess fcc fcd fce fcf fci fco fcr fcs fdc fdd fde fdf fdi fdo fdr fds fec fed fee fef fei feo fer fes ffc ffd ffe fff ffi ffo ffr ffs fic fid fie fif fii fir fis foc foe fof foi foo for fos frc frd fre frf fri fro frr frs fsc fsd fse fsf fsi fso fsr fss i-d i-f icc icd ice icf ici ico icr ics idc idd ide idf idi ido idr ids ie- iec ied iee ief iei ier ies ifc ifd ife iff ifi ifo ifr ifs iic iid iie iif iii iio iir iis io- ioc iod ioe iof ioi ioo ior ios ir- irc ird ire irf iri iro irr irs is- isc isd ise isf isi iso isr iss o-i oc- occ ocd ocf oci oco ocr ocs odc odd ode odf odi odo odr ods oec oed oee oef oei oeo oer oes of- ofc ofd ofe off ofi ofo ofr ofs oic oid oie oif oii oio oir ois oo- ooc ood oof ooi ooo oor oos or- orc ord ore orf ori oro orr ors os- osc osd ose osf osi oso osr oss rcc rcd rce rcf rci rco rcr rcs rdc rdd rde rdf rdi rdo rdr rds re- rec red ree ref rei reo rer res rfc rfd rfe rff rfi rfo rfr rfs ric rid rie rif rii rio rir ris roc rod roe rof roi roo ror ros rrc rrd rrf rri rrr rrs rsc rsd rse rsf rsi rso rsr rss scc scd sce scf sci sco scr scs sdc sdd sde sdf sdi sdo sdr sds se- sec sed see sef sei seo ser ses sfc sfd sfe sff sfi sfo sfr sfs sic sid sie sif sii sio sir sis soc sod soe sof soi soo sor sos sr- src srd sre srf sri sro srr srs ss- ssc ssd sse ssf ssi sso ssr sss