c-- ccc cce cck ccl ccs ccu ce- cec cee cek cel ces ceu ckc cks cl- clc cle clk cll cls clu csc cse csk csl css csu cuc cue cuk cul cus cuu ec- ecc ece eck ecl ecs ecu eec eee eek eel ees ekc eke ekl eks eku elc ele elk ell els elu es- esc ese esk esl ess esu eu- euc eue eul eus kcc kce kck kcl kcs kcu ke- kec kee kek kel kes kkc kke kkk kkl kks kku kl- klc kls klu ksc kse ksk ksl kss ksu kuc kue kuk kul kus kuu lcc lce lck lcl lcs lcu lec lee lek lel les leu lkl lks llc lle llk lll lls llu lsc lse lsk lsl lss lsu luc lue luk lul lus luu scc sce sck scl scs scu se- sec see sek sel ses seu sk- skc ske skk skl sks sku slc sle slk sll sls slu ss- ssc sse ssk ssl sss ssu suc sue suk sul sus suu ucc uce uck ucl ucs ucu uec uee uel ues ukc uke ukk ukl uku ulc ule ulk ull uls ulu usc use usk usl uss usu uuc uue uus uuu