bbbb bbpr bmop bnor bnpp bnrr bobb bobo bomb bomp bonn bono boob boom boon boop boor bopp bor- borm born boro borr bpmn brno brob brom bron broo bror brrm brrr mmmm mmor mmpr mmrp mnbb mnop mnpo mobb mobo momo mon- monn mono moob moon moop moor mopp morb morn moro mppp mpro mprp mrbb mrbm mron nbbo nbpp nmon nnnn nnpr nobm nobo nom- nomo non- nonn nono noo- noob noon nooo noop noor nor- norb norm norn noro norr nprm nron nrpn obbo obon obor obro ombo omn- omo- omon omoo omor omro onno onon onor oooo opo- opon opor oppo orbb orbo ormn ormo orno oro- orom oron oror orro pbmr pmbr pmmp pmpm pmpo pnnm pnom pnon pnpo pnpp pnro pobo pomo pomp pono ponp poon poop poor pop- popo popp porb porn poro porr pppn pppo pppp pprm prnp pro- prob prom pron proo prop prrm rbbb rbbr rmon rmrp rnbr rob- robb robo romb romm romo romp rono roob room roon roop roor ropo roro rpob rpon rppn rrmp rrrr