-er -ic c-- ccc cce ccf cci cco ccp ccr ccs ce- cec cee cef cei ceo cep cer ces cfc cfe cff cfi cfo cfp cfr cfs ci- cic cie cif cii cio cip cir cis co- coc coe cof coi coo cop cor cos cpc cpe cpf cpi cpo cpp cpr cps crc cre crf cri cro crp crr crs csc cse csf csi cso csp csr css ec- ecc ece ecf eci eco ecr ecs eec eee eef eeo eep eer ees ef- efc efe eff efi efo efp efr efs eic eie eif eii eio eip eir eis eo- eoc eoe eof eoi eoo eop eor eos ep- epc epe epf epi epo epp epr eps erc ere erf eri ero erp err ers es- esc ese esf esi eso esp esr ess fcc fce fcf fci fco fcp fcr fcs fec fee fef fei feo fep fer fes ffc ffe fff ffi ffo ffp ffr ffs fic fie fif fii fip fir fis foc foe fof foi foo fop for fos fpc fpe fpi fpo fpp fpr fps frc fre frf fri fro frp frr frs fsc fse fsf fsi fso fsp fsr fss i-f icc ice icf ici ico icp icr ics ie- iec iee ief iei iep ier ies ifc ife iff ifi ifo ifp ifr ifs iic iie iif iii iio iip iir iis io- ioc ioe iof ioi ioo iop ior ios ipc ipe ipf ipi ipo ipp ipr ips ir- irc ire irf iri iro irp irr irs is- isc ise isf isi iso isp isr iss o-i oc- occ ocf oci oco ocp ocr ocs oec oee oef oei oeo oep oer oes of- ofc ofe off ofi ofo ofp ofr ofs oic oie oif oii oio oip oir ois oo- ooc oof ooi ooo oop oor oos op- opc ope opf opi opo opp opr ops or- orc ore orf ori oro orp orr ors os- osc ose osf osi oso osp osr oss p-p pcc pce pcf pci pco pcp pcr pcs pec pee pef pei peo pep per pes pfc pfe pff pfi pfo pfp pfr pfs pic pie pif pii pio pip pir pis poc poe pof poi poo pop por pos ppc ppe ppf ppi ppo ppp ppr pps prc pre prf pri pro prp prr prs ps- psc pse psf psi pso psp psr pss rcc rce rcf rci rco rcp rcr rcs re- rec ree ref rei reo rep rer res rfc rfe rff rfi rfo rfp rfr rfs ric rie rif rii rio rip rir ris roc roe rof roi roo rop ror ros rpc rpe rpf rpi rpo rpp rpr rps rrc rrf rri rrp rrr rrs rsc rse rsf rsi rso rsp rsr rss scc sce scf sci sco scp scr scs se- sec see sef sei seo sep ser ses sfc sfe sff sfi sfo sfp sfr sfs sic sie sif sii sio sip sir sis soc soe sof soi soo sop sor sos spc spe spf spi spo spp spr sps sr- src sre srf sri sro srp srr srs ss- ssc sse ssf ssi sso ssp ssr sss