import util, cp.
main =>
  N = 3,
  println(permutations=permutations(1..N)), % built in
  println(permutation=findall(P,permutation([a,b,c],P))), % built-in
  println(permutation_rec1=findall(P,permutation_rec1(1..N,P))),
  println(permutation_rec2=findall(P,permutation_rec2(1..N,P))),
  println(permutation_cp1=permutation_cp1(N)),
  println(permutation_cp2=findall(P,permutation_cp2(N,P))),
  println(permutation_cp_list=permutation_cp_list("abc")).