-er c-- ccc cce ccr ccs cct ccu ccx ce- cec cee cer ces cet ceu cex crc cre crr crs crt cru crx csc cse csr css cst csu csx ctc cte ctr cts ctt ctu ctx cuc cue cur cus cut cuu cxc cxr cxs cxt cxx ec- ecc ece ecr ecs ect ecu ecx eec eee eer ees eet eex erc ere err ers ert eru es- esc ese esr ess est esu esx etc ete etr ets ett etu etx eu- euc eue eur eus eut eux ex- exc exe exr exs ext exu exx rcc rce rcr rcs rct rcu rcx re- rec ree rer res ret reu rex rrc rrr rrs rrt rru rsc rse rsr rss rst rsu rsx rtc rte rtr rts rtt rtu rtx ruc rue rur rus rut ruu rux rxr rxs scc sce scr scs sct scu scx se- sec see ser ses set seu sex sr- src sre srr srs srt srx ss- ssc sse ssr sss sst ssu ssx stc ste str sts stt stu stx suc sue sur sus sut suu sux sxc sxs sxt sxu t-x tcc tce tcr tcs tct tcu tcx te- tec tee ter tes tet teu tex trc tre trr trs trt tru trx tsc tse tsr tss tst tsu tsx ttc tte ttr tts ttt ttu ttx tuc tue tur tus tut tuu tux txe txs txt txu ucc uce ucr ucs uct ucu uec uee uer ues uet ur- urc ure urr urs urt uru urx usc use usr uss ust usu usx utc ute utr uts utt utu utx uuc uue uur uus uut uuu uxc uxr uxt uxu xcr xcx xee xer xes xet xeu xex xrc xrt xrx xsc xss xst xtc xtr xts xtx xue xus xxx