-ol bbb bbc bbf bbg bbl bbo bcb bcc bcf bcg bcl bco bfb bfc bff bfg bfl bfo bgb bgc bgf bgg bgl bgo blb blc blf blg bll blo bob boc bof bog bol boo c-- cbb cbc cbf cbg cbl cbo ccb ccc ccf ccg ccl cco cfb cfc cff cfg cfl cfo cgb cgc cgg cgl cgo cl- clb clc clf clg cll clo co- cob coc cof cog col coo fbb fbc fbf fbg fbl fbo fcb fcc fcf fcg fcl fco ffc fff ffg ffl ffo fgb fgc fgf fgg fgl flb flc flf flg fll flo fob foc fof fog fol foo gbc gbf gbg gbl gbo gcb gcc gcf gcg gcl gco gfb gfc gff gfl gfo ggb ggc ggg ggo glb glc glf glg gll glo gob goc gof gog gol goo lbb lbc lbf lbg lbl lbo lcb lcc lcf lcg lcl lco lfb lfc lff lfg lfl lfo lgb lgc lgf lgg lgl lgo llb llc llf llg lll llo lob loc lof log lol loo ob- obb obc obf obg obl obo oc- ocb occ ocf ocg ocl oco of- ofb ofc off ofg ofl ofo ogc ogf ogg ogl ogo olb olc olf olg oll olo oo- oob ooc oof oog ool ooo