-er c-- ccc cce cck ccl ccr ccs ccu ce- cec cee cek cel cer ces ceu ckc cks cl- clc cle clk cll clr cls clu crc cre crk crl crr crs cru csc cse csk csl csr css csu cuc cue cuk cul cur cus cuu ec- ecc ece eck ecl ecr ecs ecu eec eee eek eel eer ees ekc eke ekl ekr eks eku elc ele elk ell elr els elu erc ere erk erl err ers eru es- esc ese esk esl esr ess esu eu- euc eue eul eur eus kcc kce kck kcl kcr kcs kcu ke- kec kee kek kel ker kes kkc kke kkk kkl kkr kks kku kl- klc klr kls klu krc krk krl krr krs kru ksc kse ksk ksl ksr kss ksu kuc kue kuk kul kur kus kuu lcc lce lck lcl lcr lcs lcu lec lee lek lel ler les leu lkl lkr lks llc lle llk lll llr lls llu lrc lrk lrr lrs lru lsc lse lsk lsl lsr lss lsu luc lue luk lul lur lus luu rcc rce rcl rcr rcs rcu re- rec ree rek rel rer res reu rkc rke rkk rks rku rlc rle rll rlr rls rlu rrc rrk rrl rrr rrs rru rsc rse rsk rsl rsr rss rsu ruc rue ruk rur rus ruu scc sce sck scl scr scs scu se- sec see sek sel ser ses seu sk- skc ske skk skl skr sks sku slc sle slk sll slr sls slu sr- src sre srk srl srr srs ss- ssc sse ssk ssl ssr sss ssu suc sue suk sul sur sus suu ucc uce uck ucl ucr ucs ucu uec uee uel uer ues ukc uke ukk ukl ukr uku ulc ule ulk ull ulr uls ulu ur- urc ure urk url urr urs uru usc use usk usl usr uss usu uuc uue uur uus uuu