bbbb bnor bnrr bobb bobo bomb bonn bono boob boom boon boor bor- borm born boro borr brno brob brom bron broo bror brrm brrr mmmm mmor mnbb mobb mobo momo mon- monn mono moob moon moor morb morn moro mrbb mrbm mron nbbo nmon nnnn nobm nobo nom- nomo non- nonn nono noo- noob noon nooo noor nor- norb norm norn noro norr nron obbo obon obor obro ombo omn- omo- omon omoo omor omro onno onon onor oooo orbb orbo ormn ormo orno oro- orom oron oror orro rbbb rbbr rmon rnbr rob- robb robo romb romm romo rono roob room roon roor roro rrrr