-er c-- ccc cce ccf ccg ccn cco ccr ce- cec cee cef ceg cen ceo cer cfc cfe cff cfg cfn cfo cfr cgc cge cgg cgn cgo cgr cn- cnc cne cnf cng cnn cno cnr co- coc coe cof cog con coo cor crc cre crf crg crn cro crr ec- ecc ece ecf ecg ecn eco ecr eec eee eef eeg een eeo eer ef- efc efe eff efg efo efr egc ege egf egg egn ego egr en- enc ene enf eng enn eno enr eo- eoc eoe eof eog eon eoo eor erc ere erf erg ern ero err fcc fce fcf fcg fcn fco fcr fec fee fef feg fen feo fer ffc ffe fff ffg ffn ffo ffr fgc fge fgf fgg fgn fgr fnc fne fnf fng fnn fnr foc foe fof fog fon foo for frc fre frf frg frn fro frr gcc gce gcf gcg gcn gco gcr ge- gec gee gef geg gen geo ger gfc gfe gff gfo gfr ggc ggg ggn ggo ggr gnc gne gnf gnn gno gnr goc goe gof gog gon goo gor grc gre grf grg grn gro grr ncc nce ncf ncg ncn nco ncr ne- nec nee nef neg nen neo ner nfc nfe nff nfn nfo nfr ngc nge ngf ngg ngn ngo nnc nne nnf nng nnn nno no- noc noe nof nog non noo nor nrc nre nrf nrg nrn nro nrr oc- occ ocf ocg ocn oco ocr oec oee oef oeg oen oeo oer of- ofc ofe off ofg ofn ofo ofr ogc oge ogf ogg ogn ogo on- onc one onf ong onn ono onr oo- ooc oof oog oon ooo oor or- orc ore orf org orn oro orr rcc rce rcf rcg rcn rco rcr re- rec ree ref reg ren reo rer rfc rfe rff rfg rfn rfo rfr rgc rge rgf rgg rgn rgo rgr rnc rng rnn rno rnr roc roe rof rog ron roo ror rrc rrf rrg rrn rrr