-er c-- ccc cce cck ccr cct ccu ce- cec cee cek cer cet ceu ckc ckt crc cre crk crr crt cru ctc cte ctk ctr ctt ctu cuc cue cuk cur cut cuu ec- ecc ece eck ecr ect ecu eec eee eek eer eet ekc eke ekr ekt eku erc ere erk err ert eru etc ete etk etr ett etu eu- euc eue eur eut k-t kcc kce kck kcr kct kcu ke- kec kee kek ker ket kkc kke kkk kkr kkt kku krc krk krr krt kru ktc kte ktk ktr ktt ktu kuc kue kuk kur kut kuu rcc rce rcr rct rcu re- rec ree rek rer ret reu rkc rke rkk rkt rku rrc rrk rrr rrt rru rtc rte rtk rtr rtt rtu ruc rue ruk rur rut ruu tcc tce tck tcr tct tcu te- tec tee tek ter tet teu tkc tke tkk tkr tkt trc tre trk trr trt tru ttc tte ttk ttr ttt ttu tuc tue tuk tur tut tuu ucc uce uck ucr uct ucu uec uee uer uet ukc uke ukk ukr uku ur- urc ure urk urr urt uru utc ute utk utr utt utu uuc uue uur uut uuu