-er -ic c-- ccc ccd cce cci cck ccr cct cdc cdd cde cdi cdk cdr cdt ce- cec ced cee cei cek cer cet ci- cic cid cie cii cik cir cit ckc ckd cki ckt crc crd cre cri crk crr crt ctc ctd cte cti ctk ctr ctt dcc dcd dce dci dck dcr dct ddc ddd dde ddi ddk ddr ddt de- dec ded dee dei dek der det di- dic did die dii dik dir dit dkc dke dki dkk dkr dkt drc drd dre dri drk drr drt dtc dtd dte dti dtk dtr dtt ec- ecc ecd ece eci eck ecr ect ed- edc edd ede edi edk edr edt eec eed eee eek eer eet eic eid eie eii eik eir eit ekc ekd eke eki ekr ekt erc erd ere eri erk err ert etc etd ete eti etk etr ett i-d icc icd ice ici ick icr ict idc idd ide idi idk idr idt ie- iec ied iee iei iek ier iet iic iid iie iii iir iit ikc ike iki ikk ikr ikt ir- irc ird ire iri irk irr irt itc itd ite iti itk itt k-t kcc kcd kce kci kck kcr kct kdc kde kdk kdr kdt ke- kec ked kee kei kek ker ket kic kid kie kii kik kir kit kkc kke kki kkk kkr kkt krc krd kri krk krr krt ktc kte ktk ktr ktt rcc rcd rce rci rcr rct rdc rdd rde rdi rdr rdt re- rec red ree rei rek rer ret ric rid rie rii rik rir rit rkc rke rkk rkt rrc rrd rri rrk rrr rrt rtc rtd rte rti rtk rtr rtt tcc tcd tce tci tck tcr tct tdc tdd tde tdi tdk tdr tdt te- tec ted tee tei tek ter tet tic tid tie tii tik tir tit tkc tke tkk tkr tkt trc trd tre tri trk trr trt ttc ttd tte tti ttk ttr ttt