-ol c-- ccc cck ccl cco ccs cct ckc cko cks ckt cl- clc clk cll clo cls clt co- coc cok col coo cos cot csc csk csl cso css cst ctc ctk ctl cto cts ctt k-t kcc kck kcl kcs kct kkc kkk kkl kks kkt kl- klc klo kls klt koc kok kol koo kos kot ksc ksk ksl kso kss kst ktc ktk ktl kto kts ktt lcc lck lcl lco lcs lct lkl lks lkt llc llk lll llo lls llt loc lok lol loo los lot lsc lsk lsl lso lss lst ltc ltk ltl lto lts ltt oc- occ ock ocl oco ocs oct okc okk okl oko oks olc olk oll olo ols olt oo- ooc ook ool ooo oos oot os- osc osk osl oso oss ost ot- otc otk otl oto ots ott scc sck scl sco scs sct sk- skc skk skl sko sks skt slc slk sll slo sls slt soc sok sol soo sos sot ss- ssc ssk ssl sso sss sst stc stk stl sto sts stt tcc tck tcl tco tcs tct tkc tkk tkl tko tks tkt tlc tlk tll tlo tls tlt to- toc tok tol too tos tot tsc tsk tsl tso tss tst ttc ttk ttl tto tts ttt