-er c-- ccc cce cco ccr ccs cct ccu ce- cec cee ceo cer ces cet ceu co- coc coe coo cor cos cot cou crc cre cro crr crs crt cru csc cse cso csr css cst csu ctc cte cto ctr cts ctt ctu cuc cue cuo cur cus cut cuu ec- ecc ece eco ecr ecs ect ecu eec eee eeo eer ees eet eo- eoc eoe eoo eor eos eot eou erc ere ero err ers ert eru es- esc ese eso esr ess est esu etc ete eto etr ets ett etu eu- euc eue eur eus eut oc- occ oco ocr ocs oct ocu oec oee oeo oer oes oet oo- ooc ooo oor oos oot or- orc ore oro orr ors ort oru os- osc ose oso osr oss ost osu ot- otc ote oto otr ots ott otu ou- ouc oue ouo our ous out rcc rce rco rcr rcs rct rcu re- rec ree reo rer res ret reu roc roe roo ror ros rot rou rrc rrr rrs rrt rru rsc rse rso rsr rss rst rsu rtc rte rto rtr rts rtt rtu ruc rue ruo rur rus rut ruu scc sce sco scr scs sct scu se- sec see seo ser ses set seu soc soe soo sor sos sot sou sr- src sre sro srr srs srt ss- ssc sse sso ssr sss sst ssu stc ste sto str sts stt stu suc sue suo sur sus sut suu tcc tce tco tcr tcs tct tcu te- tec tee teo ter tes tet teu to- toc toe too tor tos tot tou trc tre tro trr trs trt tru tsc tse tso tsr tss tst tsu ttc tte tto ttr tts ttt ttu tuc tue tuo tur tus tut tuu ucc uce uco ucr ucs uct ucu uec uee uer ues uet uoc uoe uoo uor uos uot ur- urc ure uro urr urs urt uru usc use uso usr uss ust usu utc ute uto utr uts utt utu uuc uue uur uus uut uuu