record array(a,b,c,d,e,f,g)

procedure dummy(u,v,x,y,z)
   suspend u | v
   return x
end

procedure main()
   write("every s1 := insert(set([]),!&lcase) ----> ",image(every s1 := insert(set([]),!&lcase)) | "none")
   write("s2 := set([\"a\",\"aa\",\"ab\",\"b\",1,2,3,4]) ----> ",image(s2 := set(["a","aa","ab","b",1,2,3,4])) | "none")
   write("s3 := s1 ++ s2 ----> ",image(s3 := s1 ++ s2) | "none")
   write("s4 := s1 ** s2 ----> ",image(s4 := s1 ** s2) | "none")
   write("s5 := s1 -- s2 ----> ",image(s5 := s1 -- s2) | "none")
   write("*s3 ----> ",image(*s3) | "none")
   write("every write(!s3) ----> ",image(every write(!s3)) | "none")
   write("*s4 ----> ",image(*s4) | "none")
   write("every write(!s4) ----> ",image(every write(!s4)) | "none")
   write("*s5 ----> ",image(*s5) | "none")
   write("every write(!s5) ----> ",image(every write(!s5)) | "none")
   write("set([]) ++ 'a' ----> ",image(set([]) ++ 'a') | "none")
end