-er c-- ccc cce cck ccr ccs cct ccu ce- cec cee cek cer ces cet ceu ckc cks ckt crc cre crk crr crs crt cru csc cse csk csr css cst csu ctc cte ctk ctr cts ctt ctu cuc cue cuk cur cus cut cuu ec- ecc ece eck ecr ecs ect ecu eec eee eek eer ees eet ekc eke ekr eks ekt eku erc ere erk err ers ert eru es- esc ese esk esr ess est esu etc ete etk etr ets ett etu eu- euc eue eur eus eut k-t kcc kce kck kcr kcs kct kcu ke- kec kee kek ker kes ket kkc kke kkk kkr kks kkt kku krc krk krr krs krt kru ksc kse ksk ksr kss kst ksu ktc kte ktk ktr kts ktt ktu kuc kue kuk kur kus kut kuu rcc rce rcr rcs rct rcu re- rec ree rek rer res ret reu rkc rke rkk rks rkt rku rrc rrk rrr rrs rrt rru rsc rse rsk rsr rss rst rsu rtc rte rtk rtr rts rtt rtu ruc rue ruk rur rus rut ruu scc sce sck scr scs sct scu se- sec see sek ser ses set seu sk- skc ske skk skr sks skt sku sr- src sre srk srr srs srt ss- ssc sse ssk ssr sss sst ssu stc ste stk str sts stt stu suc sue suk sur sus sut suu tcc tce tck tcr tcs tct tcu te- tec tee tek ter tes tet teu tkc tke tkk tkr tks tkt trc tre trk trr trs trt tru tsc tse tsk tsr tss tst tsu ttc tte ttk ttr tts ttt ttu tuc tue tuk tur tus tut tuu ucc uce uck ucr ucs uct ucu uec uee uer ues uet ukc uke ukk ukr uku ur- urc ure urk urr urs urt uru usc use usk usr uss ust usu utc ute utk utr uts utt utu uuc uue uur uus uut uuu