bbbb bbwr bnor bnrr bobb bobo bobw bonn bono boob boon boor boow bor- born boro borr borw bown bowr brno brob bron broo bror brow brrr nbbo nnnn nobo non- nonn nono nonw noo- noob noon nooo noor nor- norb norn noro norr norw nown nron nwbn nwbw obbo obon obor obro onno onon onor oooo orbb orbo orno oro- oron oror orro orwo owow rbbb rbbr rnbr rob- robb robo rono ronw roob roon roor roro rowb rown rowr roww rrrr wbbb wbbn wbbo wbbr wbbw wbnb wbnr wbnw wbob wbon wbor wbow wbrb wbrn wbrr wbrw wbwb wbwn wbwo wnbb wnbn wnbr wnbw wnnr wnnw wnob wnoo wnor wnow wnrn wnrr wnrw wnwn wnwr wnww wobb wobn wobo wonb wonn wonw woob woon woow worb worn woro worr worw wowb wown wowo woww wrbb wrbn wrbo wrbw wrnb wrnn wrno wrnr wrnw wrob wron wroo wrow wrrb wrrn wrro wrrw wrwb wrwn wrwr wwbb wwbn wwbr wwnb wwnn wwno wwnr wwnw wwon wwor wwow wwrb wwrr wwrw wwwn wwwr wwww