-er c-- ccc cce ccg ccn cco ccr cct ce- cec cee ceg cen ceo cer cet cgc cge cgg cgn cgo cgr cgt cn- cnc cne cng cnn cno cnr cnt co- coc coe cog con coo cor cot crc cre crg crn cro crr crt ctc cte ctg ctn cto ctr ctt ec- ecc ece ecg ecn eco ecr ect eec eee eeg een eeo eer eet egc ege egg egn ego egr egt en- enc ene eng enn eno enr ent eo- eoc eoe eog eon eoo eor eot erc ere erg ern ero err ert etc ete etg etn eto etr ett gcc gce gcg gcn gco gcr gct ge- gec gee geg gen geo ger get ggc ggg ggn ggo ggr ggt gnc gne gnn gno gnr gnt goc goe gog gon goo gor got grc gre grg grn gro grr grt gtc gte gtg gtn gto gtr gtt ncc nce ncg ncn nco ncr nct ne- nec nee neg nen neo ner net ngc nge ngg ngn ngo ngt nnc nne nng nnn nno nnt no- noc noe nog non noo nor not nrc nre nrg nrn nro nrr nrt ntc nte ntg ntn nto ntr ntt oc- occ ocg ocn oco ocr oct oec oee oeg oen oeo oer oet ogc oge ogg ogn ogo ogt on- onc one ong onn ono onr ont oo- ooc oog oon ooo oor oot or- orc ore org orn oro orr ort ot- otc ote otg otn oto otr ott rcc rce rcg rcn rco rcr rct re- rec ree reg ren reo rer ret rgc rge rgg rgn rgo rgr rgt rnc rng rnn rno rnr rnt roc roe rog ron roo ror rot rrc rrg rrn rrr rrt rtc rte rtg rtn rto rtr rtt tcc tce tcg tcn tco tcr tct te- tec tee teg ten teo ter tet tgc tge tgg tgn tgo tgr tgt tnc tne tng tnn tno tnr tnt to- toc toe tog ton too tor tot trc tre trg trn tro trr trt ttc tte ttg ttn tto ttr ttt