-er c-- ccc ccd cce cck ccr cct cdc cdd cde cdk cdr cdt ce- cec ced cee cek cer cet ckc ckd ckt crc crd cre crk crr crt ctc ctd cte ctk ctr ctt dcc dcd dce dck dcr dct ddc ddd dde ddk ddr ddt de- dec ded dee dek der det dkc dke dkk dkr dkt drc drd dre drk drr drt dtc dtd dte dtk dtr dtt ec- ecc ecd ece eck ecr ect ed- edc edd ede edk edr edt eec eed eee eek eer eet ekc ekd eke ekr ekt erc erd ere erk err ert etc etd ete etk etr ett k-t kcc kcd kce kck kcr kct kdc kde kdk kdr kdt ke- kec ked kee kek ker ket kkc kke kkk kkr kkt krc krd krk krr krt ktc kte ktk ktr ktt rcc rcd rce rcr rct rdc rdd rde rdr rdt re- rec red ree rek rer ret rkc rke rkk rkt rrc rrd rrk rrr rrt rtc rtd rte rtk rtr rtt tcc tcd tce tck tcr tct tdc tdd tde tdk tdr tdt te- tec ted tee tek ter tet tkc tke tkk tkr tkt trc trd tre trk trr trt ttc ttd tte ttk ttr ttt