bbb bbg bbi bbl bbr bgb bgg bgi bgl bgr bi- bib big bii bil bir blb blg bli bll blr brb brg bri brl brr gbg gbi gbl gbr ggb ggg ggi ggr gib gig gii gil gir glb glg gli gll glr grb grg gri grl grr ibb ibg ibi ibl ibr igb igg igi igl igr iib iii iil iir il- ilb ilg ili ill ilr ir- irb irg iri irl irr lbb lbg lbi lbl lbr lgb lgg lgi lgl lgr lib lig lii lil lir llb llg lli lll llr lrb lrg lri lrr rbb rbg rbi rbl rbr rgb rgg rgi rgr rib rig rii ril rir rlg rli rll rlr rrb rrg rri rrl rrr