bbbb bblb blno blob blon bloo bnor bnrr bobb bobo boll boln bolo bonn bono boob bool boon boor booz bor- born boro borr borz bozo brno brob brol bron broo bror broz brrr bzzz lblr lboz llll lloo lob- lobb lobo loll lolo lolz lono lonr loob lool loon loor looz lorn loro lron lrrr nbbo nlrb nnnn nobo noll nolo non- nonn nono noo- noob nool noon nooo noor nor- norb norn noro norr nrlb nron nrrl nzrb obbo obol obon obor obro olbo ollo olon olor onno onon onor onoz onzo oolo oooo orbb orbo orlo orno oro- oron oror oroz orro orzo ozon rbbb rbbr rnbr rob- robb robo roll rolo rono roob rool roon roor rooz roro rozz rrrr z-ro zobo zoll zolo zon- zoo- zool zoon zorb zorn zoro zozo zzzz