-er c-- ccc cce ccg ccn ccp ccr ce- cec cee ceg cen cep cer cgc cge cgg cgn cgp cgr cn- cnc cne cng cnn cnp cnr cpc cpe cpg cpn cpp cpr crc cre crg crn crp crr ec- ecc ece ecg ecn ecr eec eee eeg een eep eer egc ege egg egn egp egr en- enc ene eng enn enp enr ep- epc epe epg epn epp epr erc ere erg ern erp err g-p gcc gce gcg gcn gcp gcr ge- gec gee geg gen gep ger ggc ggg ggn ggp ggr gnc gne gnn gnp gnr gpc gpe gpg gpn gpp gpr grc gre grg grn grp grr ncc nce ncg ncn ncp ncr ne- nec nee neg nen nep ner ngc nge ngg ngn ngp nnc nne nng nnn nnp npc npe npg npn npp npr nrc nre nrg nrn nrp nrr p-p pcc pce pcg pcn pcp pcr pec pee peg pen pep per pgc pge pgg pgn pgp pgr pn- pnc pne png pnn pnp pnr ppc ppe ppg ppn ppp ppr prc pre prg prn prp prr rcc rce rcg rcn rcp rcr re- rec ree reg ren rep rer rgc rge rgg rgn rgp rgr rnc rng rnn rnp rnr rpc rpe rpg rpn rpp rpr rrc rrg rrn rrp rrr