-ol c-- ccc ccl cco ccs cct cl- clc cll clo cls clt co- coc col coo cos cot csc csl cso css cst ctc ctl cto cts ctt lcc lcl lco lcs lct llc lll llo lls llt loc lol loo los lot lsc lsl lso lss lst ltc ltl lto lts ltt oc- occ ocl oco ocs oct olc oll olo ols olt oo- ooc ool ooo oos oot os- osc osl oso oss ost ot- otc otl oto ots ott scc scl sco scs sct slc sll slo sls slt soc sol soo sos sot ss- ssc ssl sso sss sst stc stl sto sts stt tcc tcl tco tcs tct tlc tll tlo tls tlt to- toc tol too tos tot tsc tsl tso tss tst ttc ttl tto tts ttt