!7

p-exp {
  for (L<Int> l : allSpreads(5, 3))
    printStruct(l);
    
  LL<Int> l = asList(allSpreads(5, 3));
  LL<Int> l2 = reversed(map reversed(l));
  pnlStruct(zipTwoListsToPairs_ifSameLength(l, l2));
}