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// modification, are permitted provided that the following conditions are
// met:
//
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function AndBB(x,y) {
  return (x == 0) && (y == 0);
}

function AndBN(x,y) {
  return (x == 0) && y;
}

function AndNB(x,y) {
  return x && (y == 0);
}

function AndNN(x,y) {
  return x && y;
}

assertTrue(AndBB(0, 0));
assertFalse(AndBB(1, 0));
assertFalse(AndBB(0, 1));
assertFalse(AndBB(1, 1));

assertEquals(0, AndBN(0, 0));
assertEquals(1, AndBN(0, 1));
assertFalse(AndBN(1, 0));
assertEquals(1, AndBN(0, 1));
assertEquals(2, AndBN(0, 2));
assertFalse(AndBN(1, 1));
assertFalse(AndBN(1, 2));

assertEquals(0, AndNB(0, 0));
assertTrue(AndNB(1, 0));
assertEquals(0, AndNB(0, 1));
assertEquals("", AndNB("", 1));
assertFalse(AndNB(1, 1));
assertTrue(AndNB(2, 0));

assertEquals(0, AndNN(0, 0));
assertEquals(0, AndNN(1, 0));
assertEquals(0, AndNN(2, 0));
assertEquals(0, AndNN(0, 1));
assertEquals(0, AndNN(0, 2));
assertEquals(1, AndNN(1, 1));
assertEquals(2, AndNN(3, 2));