nnnn nnot nnpr nntn non- nonn nono nont noo- noon nooo noop noor noot nor- norn noro norr nort not- noto nott nprt nptn nron nrpn ntop ntto nttr onno onon onor onpt ont- onto oont oooo oort ootp opo- opon opor oppo optn opto orno oro- oron oror orot orro orto oto- oton otoo otor otpp otro otto pnon pnot pnpo pnpp pnro pntr pono ponp pont poon poop poor poot pop- popo popp popt porn poro porr port poto pott pppn pppo pppp pptn pptt prnp pro- pron proo prop prot prtp prtr ptop rnnt rnot rntp rono ront roon roop roor root ropo roro rort rotn roto rotr rott rpon rppn rptn rrrr rttp tonn tono toon toor toot top- topo topp topt torn toro torp torr tort toto totr tott tpon tppp tppr tptp tptr trno tron troo trop trot trpn trpp trtr tton ttop tttt