llll lloo loll lolo lono lonr lool loon loor lorn loro loul loun lour louu lron lrrr lull lulu lunn luno nnnn noll nolo non- nonn nono nonu noo- nool noon nooo noor nor- norn noro norr noul noun nour nron nrrl null nunn nuno nuon nurl nurn nurr nuru ollo olon olor olur onno onon onor onur oolo oooo orlo orlu orno oro- oron oror orro oulu oun- our- ourn ouro ouu- roll rolo rono rool roon roor roro roru roul roun rrrr rrun rull rulo runn runo ruro ruru ruun ullo ullr ulno ulo- ulul unno unon unro uor- uro- urol uroo urun urur uulu uuno uuuu