-er c-- ccc cce ccg ccn cco ccp ccr ccs ce- cec cee ceg cen ceo cep cer ces cgc cge cgg cgn cgo cgp cgr cgs cn- cnc cne cng cnn cno cnp cnr cns co- coc coe cog con coo cop cor cos cpc cpe cpg cpn cpo cpp cpr cps crc cre crg crn cro crp crr crs csc cse csg csn cso csp csr css ec- ecc ece ecg ecn eco ecr ecs eec eee eeg een eeo eep eer ees egc ege egg egn ego egp egr egs en- enc ene eng enn eno enp enr ens eo- eoc eoe eog eon eoo eop eor eos ep- epc epe epg epn epo epp epr eps erc ere erg ern ero erp err ers es- esc ese esg esn eso esp esr ess g-p gcc gce gcg gcn gco gcp gcr gcs ge- gec gee geg gen geo gep ger ges ggc ggg ggn ggo ggp ggr ggs gnc gne gnn gno gnp gnr gns goc goe gog gon goo gop gor gos gpc gpe gpg gpn gpo gpp gpr gps grc gre grg grn gro grp grr grs gsc gse gsg gsn gso gsp gsr gss ncc nce ncg ncn nco ncp ncr ncs ne- nec nee neg nen neo nep ner nes ngc nge ngg ngn ngo ngp ngs nnc nne nng nnn nno nnp nns no- noc noe nog non noo nop nor nos npc npe npg npn npo npp npr nps nrc nre nrg nrn nro nrp nrr nrs nsc nse nsg nsn nso nsp nsr nss oc- occ ocg ocn oco ocp ocr ocs oec oee oeg oen oeo oep oer oes ogc oge ogg ogn ogo ogp ogs on- onc one ong onn ono onp onr ons oo- ooc oog oon ooo oop oor oos op- opc ope opg opn opo opp opr ops or- orc ore org orn oro orp orr ors os- osc ose osg osn oso osp osr oss p-p pcc pce pcg pcn pco pcp pcr pcs pec pee peg pen peo pep per pes pgc pge pgg pgn pgo pgp pgr pgs pn- pnc pne png pnn pno pnp pnr pns poc poe pog pon poo pop por pos ppc ppe ppg ppn ppo ppp ppr pps prc pre prg prn pro prp prr prs ps- psc pse psg psn pso psp psr pss rcc rce rcg rcn rco rcp rcr rcs re- rec ree reg ren reo rep rer res rgc rge rgg rgn rgo rgp rgr rgs rnc rng rnn rno rnp rnr rns roc roe rog ron roo rop ror ros rpc rpe rpg rpn rpo rpp rpr rps rrc rrg rrn rrp rrr rrs rsc rse rsg rsn rso rsp rsr rss scc sce scg scn sco scp scr scs se- sec see seg sen seo sep ser ses sgc sge sgg sgn sgo sgp sgr sgs snc sne sng snn sno snp snr sns soc soe sog son soo sop sor sos spc spe spg spn spo spp spr sps sr- src sre srg srn sro srp srr srs ss- ssc sse ssg ssn sso ssp ssr sss