assertTrue(eq.equal(a2, a2));
assertTrue(eq.equal(b1, b1));
assertTrue(eq.equal(b1, b2));
assertTrue(eq.equal(b2, b1));
assertTrue(eq.equal(b2, b2));
assertFalse(eq.equal(a1, b1));
assertFalse(eq.equal(a1, b2));
assertFalse(eq.equal(a2, b1));
assertFalse(eq.equal(a2, b2));