c-- ccc cce ccf cck ccl ccs ccu ce- cec cee cef cek cel ces ceu cfc cfe cff cfk cfl cfs cfu ckc cks cl- clc cle clf clk cll cls clu csc cse csf csk csl css csu cuc cue cuf cuk cul cus cuu ec- ecc ece ecf eck ecl ecs ecu eec eee eef eek eel ees ef- efc efe eff efl efs ekc eke ekf ekl eks eku elc ele elf elk ell els elu es- esc ese esf esk esl ess esu eu- euc eue euf eul eus fcc fce fcf fck fcl fcs fcu fec fee fef fek fel fes feu ffc ffe fff ffk ffl ffs ffu fkc fkf fkk fkl flc fle flf fll fls flu fsc fse fsf fsk fsl fss fsu fue fuf fuk ful fus fuu kcc kce kck kcl kcs kcu ke- kec kee kef kek kel kes kfc kff kfs kfu kkc kke kkk kkl kks kku kl- klc klf kls klu ksc kse ksf ksk ksl kss ksu kuc kue kuk kul kus kuu lcc lce lcf lck lcl lcs lcu lec lee lef lek lel les leu lfc lfe lff lfk lfl lfs lfu lkl lks llc lle llf llk lll lls llu lsc lse lsf lsk lsl lss lsu luc lue luf luk lul lus luu scc sce scf sck scl scs scu se- sec see sef sek sel ses seu sfc sfe sff sfk sfl sfs sfu sk- skc ske skf skk skl sks sku slc sle slf slk sll sls slu ss- ssc sse ssf ssk ssl sss ssu suc sue suf suk sul sus suu ucc uce ucf uck ucl ucs ucu uec uee uef uel ues ufc ufe uff ufl ufs ufu ukc uke ukf ukk ukl uku ulc ule ulf ulk ull uls ulu usc use usf usk usl uss usu uuc uue uus uuu