-er c-- ccc ccd cce cco ccr cct ccx cdc cdd cde cdo cdr cdt cdx ce- cec ced cee ceo cer cet cex co- coc cod coe coo cor cot cox crc crd cre cro crr crt crx ctc ctd cte cto ctr ctt ctx cxc cxo cxr cxt cxx dcc dcd dce dco dcr dct dcx ddc ddd dde ddo ddr ddt ddx de- dec ded dee deo der det dex doc dod doe doo dor dot dox drc drd dre dro drr drt drx dtc dtd dte dto dtr dtt dtx dxc dxd dxo dxr dxt dxx ec- ecc ecd ece eco ecr ect ecx ed- edc edd ede edo edr edt edx eec eed eee eeo eer eet eex eo- eoc eod eoe eoo eor eot erc erd ere ero err ert etc etd ete eto etr ett etx ex- exc exd exe exo exr ext exx oc- occ ocd oco ocr oct ocx odc odd ode odo odr odt oec oed oee oeo oer oet oex oo- ooc ood ooo oor oot oox or- orc ord ore oro orr ort orx ot- otc otd ote oto otr ott ox- oxc oxo oxt oxx rcc rcd rce rco rcr rct rcx rdc rdd rde rdo rdr rdt rdx re- rec red ree reo rer ret rex roc rod roe roo ror rot rox rrc rrd rrr rrt rtc rtd rte rto rtr rtt rtx rxr t-x tcc tcd tce tco tcr tct tcx tdc tdd tde tdo tdr tdt tdx te- tec ted tee teo ter tet tex to- toc tod toe too tor tot tox trc trd tre tro trr trt trx ttc ttd tte tto ttr ttt ttx txe txt xcd xcr xcx xdc xde xdr xdt xed xee xer xet xex xoc xod xoo xor xot xox xrc xrd xrt xrx xtc xtr xtx xxo xxx