abstract class Key {
  int get a => runtimeType.hashCode and null.hashCode;
  int get b => runtimeType.hashCode & null.hashCode;
  int get c { return runtimeType.hashCode and null.hashCode; }
  int get d { return runtimeType.hashCode & null.hashCode; }

  int get e => 1 + runtimeType.hashCode and null.hashCode + 3;
  int get f => 1 + runtimeType.hashCode & null.hashCode + 3;
  int get g { return 1 + runtimeType.hashCode and null.hashCode + 3; }
  int get h { return 1 + runtimeType.hashCode & null.hashCode + 3; }

  int i(int x, int y) => x and y;
  int j(int x, int y) => x & y;
  int k(int x, int y) { return x and y; }
  int l(int x, int y) { return x & y; }
  int m(int x, int y) { int z =  x and y; return z; }
  int n(int x, int y) { int z = x & y; return z; }

  int o(int x, int y) => 1 + x and y + 3;
  int p(int x, int y) => 1 + x & y + 3;
  int q(int x, int y) { return 1 + x and y + 3; }
  int r(int x, int y) { return 1 + x & y + 3; }

  s(int x, int y) {
    s(x and y, x and y);
    s(x & y, x & y);
  }

  Key(int x, int y) : foo = x and y, bar = x and y {
    print("hello ${x and y}");
  }

  Key(int x, int y) : foo = x & y, bar = x & y {
    print("hello ${x & y}");
  }

  not_currently_working(int x, int y) {
    x and y;
    x & y;
  }
}