-er c-- ccc cce ccn ccr ccs cct ccu ce- cec cee cen cer ces cet ceu cn- cnc cne cnn cnr cns cnt cnu crc cre crn crr crs crt cru csc cse csn csr css cst csu ctc cte ctn ctr cts ctt ctu cuc cue cun cur cus cut cuu ec- ecc ece ecn ecr ecs ect ecu eec eee een eer ees eet en- enc ene enn enr ens ent enu erc ere ern err ers ert eru es- esc ese esn esr ess est esu etc ete etn etr ets ett etu eu- euc eue eun eur eus eut ncc nce ncn ncr ncs nct ncu ne- nec nee nen ner nes net neu nnc nne nnn nns nnt nnu nrc nre nrn nrr nrs nrt nru nsc nse nsn nsr nss nst nsu ntc nte ntn ntr nts ntt ntu nuc nue nun nur nus nut nuu rcc rce rcn rcr rcs rct rcu re- rec ree ren rer res ret reu rnc rnn rnr rns rnt rnu rrc rrn rrr rrs rrt rru rsc rse rsn rsr rss rst rsu rtc rte rtn rtr rts rtt rtu ruc rue run rur rus rut ruu scc sce scn scr scs sct scu se- sec see sen ser ses set seu snc sne snn snr sns snt snu sr- src sre srn srr srs srt ss- ssc sse ssn ssr sss sst ssu stc ste stn str sts stt stu suc sue sun sur sus sut suu tcc tce tcn tcr tcs tct tcu te- tec tee ten ter tes tet teu tnc tne tnn tnr tns tnt trc tre trn trr trs trt tru tsc tse tsn tsr tss tst tsu ttc tte ttn ttr tts ttt ttu tuc tue tun tur tus tut tuu ucc uce ucn ucr ucs uct ucu uec uee uen uer ues uet un- unc une unn unr uns unt unu ur- urc ure urn urr urs urt uru usc use usn usr uss ust usu utc ute utn utr uts utt utu uuc uue uun uur uus uut uuu