-er -ic c-- ccc cce cci ccr ccs cct ccu ccx ce- cec cee cei cer ces cet ceu cex ci- cic cie cii cir cis cit ciu cix crc cre cri crr crs crt cru crx csc cse csi csr css cst csu csx ctc cte cti ctr cts ctt ctu ctx cuc cue cui cur cus cut cuu cxc cxi cxr cxs cxt cxx ec- ecc ece eci ecr ecs ect ecu ecx eec eee eer ees eet eex eic eie eii eir eis eit eiu eix erc ere eri err ers ert eru es- esc ese esi esr ess est esu esx etc ete eti etr ets ett etu etx eu- euc eue eui eur eus eut eux ex- exc exe exi exr exs ext exu exx icc ice ici icr ics ict icu ie- iec iee iei ier ies iet iex iic iie iii iir iis iit iiu iix ir- irc ire iri irr irs irt iru irx is- isc ise isi isr iss ist isu itc ite iti its itt itu itx iu- iuc iue iui iur ius iut ixc ixe ixi rcc rce rci rcr rcs rct rcu rcx re- rec ree rei rer res ret reu rex ric rie rii rir ris rit rix rrc rri rrr rrs rrt rru rsc rse rsi rsr rss rst rsu rsx rtc rte rti rtr rts rtt rtu rtx ruc rue rui rur rus rut ruu rux rxr rxs scc sce sci scr scs sct scu scx se- sec see sei ser ses set seu sex sic sie sii sir sis sit siu six sr- src sre sri srr srs srt srx ss- ssc sse ssi ssr sss sst ssu ssx stc ste sti str sts stt stu stx suc sue sui sur sus sut suu sux sxc sxi sxs sxt sxu t-x tcc tce tci tcr tcs tct tcu tcx te- tec tee tei ter tes tet teu tex tic tie tii tir tis tit tiu tix trc tre tri trr trs trt tru trx tsc tse tsi tsr tss tst tsu tsx ttc tte tti ttr tts ttt ttu ttx tuc tue tui tur tus tut tuu tux txe txi txs txt txu ucc uce uci ucr ucs uct ucu uec uee uei uer ues uet uic uie uii uir uis uit uiu ur- urc ure uri urr urs urt uru urx usc use usi usr uss ust usu usx utc ute uti utr uts utt utu utx uuc uue uur uus uut uuu uxc uxr uxt uxu xci xcr xcx xee xer xes xet xeu xex xic xie xii xis xit xiu xix xrc xrt xrx xsc xsi xss xst xtc xti xtr xts xtx xue xui xus xxi xxx