-er -ic c-- ccc cce cci ccr cct ccx ce- cec cee cei cer cet cex ci- cic cie cii cir cit cix crc cre cri crr crt crx ctc cte cti ctr ctt ctx cxc cxi cxr cxt cxx ec- ecc ece eci ecr ect ecx eec eee eer eet eex eic eie eii eir eit eix erc ere eri err ert etc ete eti etr ett etx ex- exc exe exi exr ext exx icc ice ici icr ict ie- iec iee iei ier iet iex iic iie iii iir iit iix ir- irc ire iri irr irt irx itc ite iti itt itx ixc ixe ixi rcc rce rci rcr rct rcx re- rec ree rei rer ret rex ric rie rii rir rit rix rrc rri rrr rrt rtc rte rti rtr rtt rtx rxr t-x tcc tce tci tcr tct tcx te- tec tee tei ter tet tex tic tie tii tir tit tix trc tre tri trr trt trx ttc tte tti ttr ttt ttx txe txi txt xci xcr xcx xee xer xet xex xic xie xii xit xix xrc xrt xrx xtc xti xtr xtx xxi xxx