!7

p {
  for (S listName, keysListName : mechMap("List => Mandatory keys list")) {
    L<S> mandatory = mL(keysListName);
    SS entries = mechMap(listName);
    L<S> missing = listMinusSet(keys(entries), mandatory);
    if (empty(missing)) continue;
    printAsciiHeading("Missing keys in: " + listName);
    pnl(missing);
  }
}