-er c-- ccc cce cco ccr ccs cct ccu ccx ce- cec cee ceo cer ces cet ceu cex co- coc coe coo cor cos cot cou cox crc cre cro crr crs crt cru crx csc cse cso csr css cst csu csx ctc cte cto ctr cts ctt ctu ctx cuc cue cuo cur cus cut cuu cxc cxo cxr cxs cxt cxx ec- ecc ece eco ecr ecs ect ecu ecx eec eee eeo eer ees eet eex eo- eoc eoe eoo eor eos eot eou erc ere ero err ers ert eru es- esc ese eso esr ess est esu esx etc ete eto etr ets ett etu etx eu- euc eue eur eus eut eux ex- exc exe exo exr exs ext exu exx oc- occ oco ocr ocs oct ocu ocx oec oee oeo oer oes oet oex oo- ooc ooo oor oos oot oox or- orc ore oro orr ors ort oru orx os- osc ose oso osr oss ost osu osx ot- otc ote oto otr ots ott otu ou- ouc oue ouo our ous out ox- oxc oxo oxt oxx rcc rce rco rcr rcs rct rcu rcx re- rec ree reo rer res ret reu rex roc roe roo ror ros rot rou rox rrc rrr rrs rrt rru rsc rse rso rsr rss rst rsu rsx rtc rte rto rtr rts rtt rtu rtx ruc rue ruo rur rus rut ruu rux rxr rxs scc sce sco scr scs sct scu scx se- sec see seo ser ses set seu sex soc soe soo sor sos sot sou sox sr- src sre sro srr srs srt srx ss- ssc sse sso ssr sss sst ssu ssx stc ste sto str sts stt stu stx suc sue suo sur sus sut suu sux sxc sxs sxt sxu t-x tcc tce tco tcr tcs tct tcu tcx te- tec tee teo ter tes tet teu tex to- toc toe too tor tos tot tou tox trc tre tro trr trs trt tru trx tsc tse tso tsr tss tst tsu tsx ttc tte tto ttr tts ttt ttu ttx tuc tue tuo tur tus tut tuu tux txe txs txt txu ucc uce uco ucr ucs uct ucu uec uee uer ues uet uoc uoe uoo uor uos uot uox ur- urc ure uro urr urs urt uru urx usc use uso usr uss ust usu usx utc ute uto utr uts utt utu utx uuc uue uur uus uut uuu uxc uxo uxr uxt uxu xcr xcx xee xer xes xet xeu xex xoc xoo xor xos xot xox xrc xrt xrx xsc xss xst xtc xtr xts xtx xue xus xxo xxx