Rollerworld is a public skating rink that welcomes everyone from beginners to experts. NOTICE -- under 12's must be taken care of by an adult. -- small cost for adults watching children -- no dirty or dangerous skates -- dress must be neat -- no jackets, hats or open clothing to be worn -- no newspapers, books, magazines, games allowed in Roller Cafe or Roller Bar -- no smoking except in Roller Bar and smoking room of Roller Cafe -- over 18's only in Roller Bar "Roller skating fun for everyone" From the poster we know Rollerworld can only be visited by people   _  .
who can roller skate well who are over eighteen who are neatly dressed who are learning how to roller skate