-ol c-- ccc ccl cco ccr ccs cl- clc cll clo clr cls co- coc col coo cor cos crc crl cro crr crs csc csl cso csr css lcc lcl lco lcr lcs llc lll llo llr lls loc lol loo lor los lrc lro lrr lrs lsc lsl lso lsr lss oc- occ ocl oco ocr ocs olc oll olo ols oo- ooc ool ooo oor oos or- orc orl oro orr ors os- osc osl oso osr oss rcc rcl rco rcr rcs rlc rll rlo rlr rls roc rol roo ror ros rrc rrl rrr rrs rsc rsl rso rsr rss scc scl sco scr scs slc sll slo slr sls soc sol soo sor sos sr- src srl sro srr srs ss- ssc ssl sso ssr sss