-ol c-- ccc cck ccl cco ccs ckc cko cks cl- clc clk cll clo cls co- coc cok col coo cos csc csk csl cso css kcc kck kcl kcs kkc kkk kkl kks kl- klc klo kls koc kok kol koo kos ksc ksk ksl kso kss lcc lck lcl lco lcs lkl lks llc llk lll llo lls loc lok lol loo los lsc lsk lsl lso lss oc- occ ock ocl oco ocs okc okk okl oko oks olc olk oll olo ols oo- ooc ook ool ooo oos os- osc osk osl oso oss scc sck scl sco scs sk- skc skk skl sko sks slc slk sll slo sls soc sok sol soo sos ss- ssc ssk ssl sso sss