-er -ic c-- ccc cce cci ccn ccp ccr ccs ccx ce- cec cee cei cen cep cer ces cex ci- cic cie cii cin cip cir cis cix cn- cnc cne cni cnn cnp cnr cns cnx cpc cpe cpi cpn cpp cpr cps cpx crc cre cri crn crp crr crs crx csc cse csi csn csp csr css csx cxc cxi cxp cxr cxs cxx ec- ecc ece eci ecn ecr ecs ecx eec eee een eep eer ees eex eic eie eii ein eip eir eis eix en- enc ene eni enn enp enr ens ep- epc epe epi epn epp epr eps epx erc ere eri ern erp err ers es- esc ese esi esn esp esr ess esx ex- exc exe exi exp exr exs exx icc ice ici icn icp icr ics ie- iec iee iei ien iep ier ies iex iic iie iii iin iip iir iis iix in- inc ine ini inn inp inr ins inx ipc ipe ipi ipn ipp ipr ips ipx ir- irc ire iri irn irp irr irs irx is- isc ise isi isn isp isr iss ixc ixe ixi ixn n-i ncc nce nci ncn ncp ncr ncs ncx ne- nec nee nei nen nep ner nes nex nic nie nii nin nip nir nis nix nnc nne nni nnn nnp nns npc npe npi npn npp npr nps nrc nre nri nrn nrp nrr nrs nrx nsc nse nsi nsn nsp nsr nss nsx nxc p-p pcc pce pci pcn pcp pcr pcs pcx pec pee pei pen pep per pes pex pic pie pii pin pip pir pis pix pn- pnc pne pni pnn pnp pnr pns pnx ppc ppe ppi ppn ppp ppr pps ppx prc pre pri prn prp prr prs prx ps- psc pse psi psn psp psr pss psx pxc pxe pxr pxs rcc rce rci rcn rcp rcr rcs rcx re- rec ree rei ren rep rer res rex ric rie rii rin rip rir ris rix rnc rni rnn rnp rnr rns rpc rpe rpi rpn rpp rpr rps rpx rrc rri rrn rrp rrr rrs rsc rse rsi rsn rsp rsr rss rsx rxp rxr rxs scc sce sci scn scp scr scs scx se- sec see sei sen sep ser ses sex sic sie sii sin sip sir sis six snc sne sni snn snp snr sns spc spe spi spn spp spr sps spx sr- src sre sri srn srp srr srs srx ss- ssc sse ssi ssn ssp ssr sss ssx sxc sxi sxn sxs xci xcp xcr xcx xee xen xep xer xes xex xic xie xii xin xis xix xnc xns xpc xpe xpn xpp xps xrc xrx xsc xsi xsp xss xxi xxp xxx