iniini inirti intron irinti nippur nitrin nitrit nitro- norito norton nurtop option output pinpin pinpon pirpir pirpit pitpit poitou ponpon ponton pontur pontür pornut poroit porput potpot propin proton purput roptri ruptur tinpir tintin tinton tipiti tiptip tipton tiroit tirpit tontin tonton topotu topton toptop torino tornio tortop tortor totopo triton tropin tuntur turtur