// This tests the labeled "next" for multifor which gives a level to jump to.
// This program demonstrates bailing out of multifor loops with labeled
// next statements.  It generates only unique lists of numbers.  (This could
// be generated efficiently with the array.permute[], or .lexicographicPermute[]
// methods, but the condition in this program could be modified for different
// conditions easily.) The labeled "next" method makes this program run about
// 5.5 times faster due to faster bailout.

s = new set

upper = 7
n = new array[[upper], new range[1,upper]]
   
LOOP:
multifor a = n
{
   len = length[a]
   for i=0 to len-1
      if s.contains[a@i]  // Duplicates found in output?
      {
         s.clear[]
         next LOOP i     // Demonstrates labeled next, jump to next level i
      } else
         s.put[a@i]

   s.clear[]      

   println[a]
}