-er -ic c-- ccc cce ccf cci cco ccr ccs ce- cec cee cef cei ceo cer ces cfc cfe cff cfi cfo cfr cfs ci- cic cie cif cii cio cir cis co- coc coe cof coi coo cor cos crc cre crf cri cro crr crs csc cse csf csi cso csr css ec- ecc ece ecf eci eco ecr ecs eec eee eef eeo eer ees ef- efc efe eff efi efo efr efs eic eie eif eii eio eir eis eo- eoc eoe eof eoi eoo eor eos erc ere erf eri ero err ers es- esc ese esf esi eso esr ess fcc fce fcf fci fco fcr fcs fec fee fef fei feo fer fes ffc ffe fff ffi ffo ffr ffs fic fie fif fii fir fis foc foe fof foi foo for fos frc fre frf fri fro frr frs fsc fse fsf fsi fso fsr fss i-f icc ice icf ici ico icr ics ie- iec iee ief iei ier ies ifc ife iff ifi ifo ifr ifs iic iie iif iii iio iir iis io- ioc ioe iof ioi ioo ior ios ir- irc ire irf iri iro irr irs is- isc ise isf isi iso isr iss o-i oc- occ ocf oci oco ocr ocs oec oee oef oei oeo oer oes of- ofc ofe off ofi ofo ofr ofs oic oie oif oii oio oir ois oo- ooc oof ooi ooo oor oos or- orc ore orf ori oro orr ors os- osc ose osf osi oso osr oss rcc rce rcf rci rco rcr rcs re- rec ree ref rei reo rer res rfc rfe rff rfi rfo rfr rfs ric rie rif rii rio rir ris roc roe rof roi roo ror ros rrc rrf rri rrr rrs rsc rse rsf rsi rso rsr rss scc sce scf sci sco scr scs se- sec see sef sei seo ser ses sfc sfe sff sfi sfo sfr sfs sic sie sif sii sio sir sis soc soe sof soi soo sor sos sr- src sre srf sri sro srr srs ss- ssc sse ssf ssi sso ssr sss