-er -ic c-- ccc cce cci ccn ccp ccr ccx ce- cec cee cei cen cep cer cex ci- cic cie cii cin cip cir cix cn- cnc cne cni cnn cnp cnr cnx cpc cpe cpi cpn cpp cpr cpx crc cre cri crn crp crr crx cxc cxi cxp cxr cxx ec- ecc ece eci ecn ecr ecx eec eee een eep eer eex eic eie eii ein eip eir eix en- enc ene eni enn enp enr ep- epc epe epi epn epp epr epx erc ere eri ern erp err ex- exc exe exi exp exr exx icc ice ici icn icp icr ie- iec iee iei ien iep ier iex iic iie iii iin iip iir iix in- inc ine ini inn inp inr inx ipc ipe ipi ipn ipp ipr ipx ir- irc ire iri irn irp irr irx ixc ixe ixi ixn n-i ncc nce nci ncn ncp ncr ncx ne- nec nee nei nen nep ner nex nic nie nii nin nip nir nix nnc nne nni nnn nnp npc npe npi npn npp npr nrc nre nri nrn nrp nrr nrx nxc p-p pcc pce pci pcn pcp pcr pcx pec pee pei pen pep per pex pic pie pii pin pip pir pix pn- pnc pne pni pnn pnp pnr pnx ppc ppe ppi ppn ppp ppr ppx prc pre pri prn prp prr prx pxc pxe pxr rcc rce rci rcn rcp rcr rcx re- rec ree rei ren rep rer rex ric rie rii rin rip rir rix rnc rni rnn rnp rnr rpc rpe rpi rpn rpp rpr rpx rrc rri rrn rrp rrr rxp rxr xci xcp xcr xcx xee xen xep xer xex xic xie xii xin xix xnc xpc xpe xpn xpp xrc xrx xxi xxp xxx