-er -ic c-- ccc ccd cce ccg cci ccr cct cdc cdd cde cdg cdi cdr cdt ce- cec ced cee ceg cei cer cet cgc cgd cge cgg cgi cgr cgt ci- cic cid cie cig cii cir cit crc crd cre crg cri crr crt ctc ctd cte ctg cti ctr ctt dcc dcd dce dcg dci dcr dct ddc ddd dde ddg ddi ddr ddt de- dec ded dee deg dei der det dgc dgd dge dgg dgi dgr dgt di- dic did die dig dii dir dit drc drd dre drg dri drr drt dtc dtd dte dtg dti dtr dtt ec- ecc ecd ece ecg eci ecr ect ed- edc edd ede edg edi edr edt eec eed eee eeg eer eet egc egd ege egg egi egr egt eic eid eie eig eii eir eit erc erd ere erg eri err ert etc etd ete etg eti etr ett g-d gcc gcd gce gcg gci gcr gct gdc gdd gde gdi gdr gdt ge- gec ged gee geg gei ger get ggc ggd ggg ggi ggr ggt gic gid gie gig gii gir git grc grd gre grg gri grr grt gtc gtd gte gtg gti gtr gtt i-d icc icd ice icg ici icr ict idc idd ide idg idi idr idt ie- iec ied iee ieg iei ier iet igc igd ige igg igi igr igt iic iid iie iii iir iit ir- irc ird ire irg iri irr irt itc itd ite itg iti itt rcc rcd rce rcg rci rcr rct rdc rdd rde rdg rdi rdr rdt re- rec red ree reg rei rer ret rgc rgd rge rgg rgi rgr rgt ric rid rie rig rii rir rit rrc rrd rrg rri rrr rrt rtc rtd rte rtg rti rtr rtt tcc tcd tce tcg tci tcr tct tdc tdd tde tdg tdi tdr tdt te- tec ted tee teg tei ter tet tgc tge tgg tgi tgr tgt tic tid tie tig tii tir tit trc trd tre trg tri trr trt ttc ttd tte ttg tti ttr ttt