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self.assertEqual({}, diff([1, 2], [1, 2]))
self.assertEqual({}, diff((1, 2), (1, 2)))
self.assertEqual({}, diff({1, 2}, {1, 2}))
self.assertEqual({}, diff({'a': 1, 'b': 2}, {'a': 1, 'b': 2}))
self.assertEqual({}, diff([], []))
self.assertEqual({}, diff(None, None))
self.assertEqual({}, diff({}, {}))
self.assertEqual({}, diff(set(), set()))
self.assertEqual(2, diff(1, 2))
self.assertEqual(False, diff(True, False))
self.assertEqual('def', diff('abc', 'def'))
self.assertEqual([3, 4], diff([1, 2], [3, 4]))
self.assertEqual((3, 4), diff((1, 2), (3, 4)))
self.assertEqual({3, 4}, diff({1, 2}, {3, 4}))
self.assertEqual({replace: {'c': 3, 'd': 4}}, diff({'a': 1, 'b': 2}, {'c': 3, 'd': 4}))
self.assertEqual({replace: {'c': 3, 'd': 4}}, diff([1, 2], {'c': 3, 'd': 4}))
self.assertEqual(123, diff({'a': 1, 'b': 2}, 123))
self.assertEqual({delete: ['b']}, diff({'a': 1, 'b': 2}, {'a': 1}))
self.assertEqual({'b': 3}, diff({'a': 1, 'b': 2}, {'a': 1, 'b': 3}))
self.assertEqual({'c': 3}, diff({'a': 1, 'b': 2}, {'a': 1, 'b': 2, 'c': 3}))
self.assertEqual({delete: ['b'], 'c': 3}, diff({'a': 1, 'b': 2}, {'a': 1, 'c': 3}))
self.assertEqual({add: {3}}, diff({1, 2}, {1, 2, 3}))
self.assertEqual({add: {3}, discard: {4}}, diff({1, 2, 4}, {1, 2, 3}))
self.assertEqual({discard: {4}}, diff({1, 2, 4}, {1, 2}))
self.assertEqual({insert: [(1, 'b')]}, diff(['a', 'c'], ['a', 'b', 'c']))
self.assertEqual({insert: [(1, 'b')], delete: [3, 0]}, diff(['x', 'a', 'c', 'x'], ['a', 'b', 'c']))
self.assertEqual(