-er -ic c-- ccc ccd cce cci ccr cct ccx cdc cdd cde cdi cdr cdt cdx ce- cec ced cee cei cer cet cex ci- cic cid cie cii cir cit cix crc crd cre cri crr crt crx ctc ctd cte cti ctr ctt ctx cxc cxi cxr cxt cxx dcc dcd dce dci dcr dct dcx ddc ddd dde ddi ddr ddt ddx de- dec ded dee dei der det dex di- dic did die dii dir dit dix drc drd dre dri drr drt drx dtc dtd dte dti dtr dtt dtx dxc dxd dxi dxr dxt dxx ec- ecc ecd ece eci ecr ect ecx ed- edc edd ede edi edr edt edx eec eed eee eer eet eex eic eid eie eii eir eit eix erc erd ere eri err ert etc etd ete eti etr ett etx ex- exc exd exe exi exr ext exx i-d icc icd ice ici icr ict idc idd ide idi idr idt idx ie- iec ied iee iei ier iet iex iic iid iie iii iir iit iix ir- irc ird ire iri irr irt irx itc itd ite iti itt itx ixc ixe ixi rcc rcd rce rci rcr rct rcx rdc rdd rde rdi rdr rdt rdx re- rec red ree rei rer ret rex ric rid rie rii rir rit rix rrc rrd rri rrr rrt rtc rtd rte rti rtr rtt rtx rxr t-x tcc tcd tce tci tcr tct tcx tdc tdd tde tdi tdr tdt tdx te- tec ted tee tei ter tet tex tic tid tie tii tir tit tix trc trd tre tri trr trt trx ttc ttd tte tti ttr ttt ttx txe txi txt xcd xci xcr xcx xdc xde xdi xdr xdt xed xee xer xet xex xic xie xii xit xix xrc xrd xrt xrx xtc xti xtr xtx xxi xxx