-ol bbb bbc bbg bbl bbo bbs bcb bcc bcg bcl bco bcs bgb bgc bgg bgl bgo bgs blb blc blg bll blo bls bob boc bog bol boo bos bsb bsc bsg bsl bso bss c-- cbb cbc cbg cbl cbo cbs ccb ccc ccg ccl cco ccs cgb cgc cgg cgl cgo cgs cl- clb clc clg cll clo cls co- cob coc cog col coo cos csb csc csg csl cso css gbc gbg gbl gbo gbs gcb gcc gcg gcl gco gcs ggb ggc ggg ggo ggs glb glc glg gll glo gls gob goc gog gol goo gos gsb gsc gsg gsl gso gss lbb lbc lbg lbl lbo lbs lcb lcc lcg lcl lco lcs lgb lgc lgg lgl lgo lgs llb llc llg lll llo lls lob loc log lol loo los lsb lsc lsg lsl lso lss ob- obb obc obg obl obo obs oc- ocb occ ocg ocl oco ocs ogc ogg ogl ogo ogs olb olc olg oll olo ols oo- oob ooc oog ool ooo oos os- osb osc osg osl oso oss sbb sbc sbg sbl sbo sbs scb scc scg scl sco scs sgb sgc sgg sgl sgo sgs slb slc slg sll slo sls sob soc sog sol soo sos ss- ssb ssc ssg ssl sso sss