static <C extends Concept> SimpleCRUD<C> simpleCRUD(Class<C> c) {
  SimpleCRUD crud = new SimpleCRUD(c);
  crud.show();
  ret crud;
}

static <C extends Concept> SimpleCRUD<C> simpleCRUD(S title, Class<C> c) {
  SimpleCRUD crud = new SimpleCRUD(c);
  crud.show(title);
  ret crud;
}