-ol b-u bbb bbg bbl bbo bbr bbu bgb bgg bgl bgo bgr bgu bgz blb blg bll blo blr blu blz bob bog bol boo bor bou boz brb brg brl bro brr bru brz bub bug bul buo bur buu buz bzo bzr bzu bzz gbg gbl gbo gbr gbu gbz ggb ggg ggo ggr ggu ggz glb glg gll glo glr glu glz gob gog gol goo gor gou goz grb grg grl gro grr gru gu- gub gug gul guo gur guu guz gzo gzr gzu lbb lbg lbl lbo lbr lbu lgb lgg lgl lgo lgr lgu llb llg lll llo llr llu llz lob log lol loo lor lou loz lrb lrg lro lrr lru lrz lub lug lul luo lur luu luz lzo lzr lzu ob- obb obg obl obo obr obu ogg ogl ogo olb olg oll olo olu oo- oob oog ool ooo oor or- orb org orl oro orr oru orz ou- oul ouo our ozo ozu ozz rbb rbg rbl rbo rbr rbu rgb rgg rgo rgr rlg rll rlo rlr rlu rob rog rol roo ror rou roz rrb rrg rrl rrr rru rub rug ruo rur ruu ruz rzb rzo ubb ubg ubl ubo ubr ubu ugb ugg ugl ugo ugr ugu ulb ulg ull ulo ulr ulu uob uog uol uoo uor ur- urb urg url uro urr uru urz uug uur uuu uzb uzo uzu z-g zbb zbl zbr zgb zgg zlr zo- zob zog zol zoo zor zou zrl zro zub zug zul zur zuz zzr zzz