-ol b-p bbb bbc bbl bbo bbp bcb bcc bcl bco bcp blb blc bll blo blp bob boc bol boo bop bpb bpc bpl bpo bpp c-- cbb cbc cbl cbo cbp ccb ccc ccl cco ccp cl- clb clc cll clo clp co- cob coc col coo cop cpb cpc cpl cpo cpp l-p lbb lbc lbl lbo lbp lcb lcc lcl lco lcp llb llc lll llo llp lob loc lol loo lop lpb lpc lpl lpo lpp ob- obb obc obl obo obp oc- ocb occ ocl oco ocp olb olc oll olo olp oo- oob ooc ool ooo oop op- opb opc opl opo opp p-p pbb pbc pbl pbo pbp pcb pcc pcl pco pcp plb plc pll plo plp pob poc pol poo pop ppb ppc ppl ppo ppp