Module Checkit {
      Global a$
      Document a$
      Module Permutations (s){
            Module Level (n, s, h)   {
                  If n=1 then {
                        while Len(s) {
                              m1=each(h)
                              while m1 {
                                    Print Array$(m1);" ";
                              }
                               Print Array$(S)
                               ToClipBoard()
                               s=cdr(s)
                         }
                  } Else {
                        for i=1 to len(s) {
                              call Level n-1, cdr(s),  cons(h, car(s))
                              s=cons(cdr(s), car(s))
                        }
                  }
                  Sub ToClipBoard()
                        local m=each(h)
                        Local b$=""
                        While m {
                              b$+=If$(Len(b$)<>0->" ","")+Array$(m)+" "
                        }
                        b$+=If$(Len(b$)<>0->" ","")+Array$(s,0)+" "+{
                        }
                        a$<=b$   ' assign to global need <=
                  End Sub
            }
            If len(s)=0 then Error
            Head=(,)
            Call Level Len(s),  s, Head
      }
      Clear a$
      Permutations (1,2,3,4)
      Permutations (100, 200, 500)
      Permutations ("A", "B", "C","D")
      Permutations ("DOG", "CAT", "BAT")
      ClipBoard a$
}
Checkit