-er -ic c-- ccc cce cci ccr ccs cct ccx ce- cec cee cei cer ces cet cex ci- cic cie cii cir cis cit cix crc cre cri crr crs crt crx csc cse csi csr css cst csx ctc cte cti ctr cts ctt ctx cxc cxi cxr cxs cxt cxx ec- ecc ece eci ecr ecs ect ecx eec eee eer ees eet eex eic eie eii eir eis eit eix erc ere eri err ers ert es- esc ese esi esr ess est esx etc ete eti etr ets ett etx ex- exc exe exi exr exs ext exx icc ice ici icr ics ict ie- iec iee iei ier ies iet iex iic iie iii iir iis iit iix ir- irc ire iri irr irs irt irx is- isc ise isi isr iss ist itc ite iti its itt itx ixc ixe ixi rcc rce rci rcr rcs rct rcx re- rec ree rei rer res ret rex ric rie rii rir ris rit rix rrc rri rrr rrs rrt rsc rse rsi rsr rss rst rsx rtc rte rti rtr rts rtt rtx rxr rxs scc sce sci scr scs sct scx se- sec see sei ser ses set sex sic sie sii sir sis sit six sr- src sre sri srr srs srt srx ss- ssc sse ssi ssr sss sst ssx stc ste sti str sts stt stx sxc sxi sxs sxt t-x tcc tce tci tcr tcs tct tcx te- tec tee tei ter tes tet tex tic tie tii tir tis tit tix trc tre tri trr trs trt trx tsc tse tsi tsr tss tst tsx ttc tte tti ttr tts ttt ttx txe txi txs txt xci xcr xcx xee xer xes xet xex xic xie xii xis xit xix xrc xrt xrx xsc xsi xss xst xtc xti xtr xts xtx xxi xxx