-er -ic c-- ccc ccd cce cci ccr cct ccz cdc cdd cde cdi cdr cdt cdz ce- cec ced cee cei cer cet cez ci- cic cid cie cii cir cit crc crd cre cri crr crt crz ctc ctd cte cti ctr ctt ctz cz- czc czd cze czt dcc dcd dce dci dcr dct ddc ddd dde ddi ddr ddt ddz de- dec ded dee dei der det dez di- dic did die dii dir dit diz drc drd dre dri drr drt drz dtc dtd dte dti dtr dtt dtz dzd dze dzi dzr ec- ecc ecd ece eci ecr ect ed- edc edd ede edi edr edt eec eed eee eer eet eic eid eie eii eir eit erc erd ere eri err ert erz etc etd ete eti etr ett etz eze ezr ezz i-d icc icd ice ici icr ict icz idc idd ide idi idr idt ie- iec ied iee iei ier iet iic iid iie iii iir iit ir- irc ird ire iri irr irt itc itd ite iti itt itz ize izi izz rcc rcd rce rci rcr rct rdc rdd rde rdi rdr rdt re- rec red ree rei rer ret rez ric rid rie rii rir rit riz rrc rrd rri rrr rrt rtc rtd rte rti rtr rtt rtz rze tcc tcd tce tci tcr tct tdc tdd tde tdi tdr tdt te- tec ted tee tei ter tet tez tic tid tie tii tir tit tiz trc trd tre tri trr trt trz ttc ttd tte tti ttr ttt tzd tze zce zdt zec zed zee zer zet zez zid zie zir zit ziz zte ztr zzr zzt zzz