count_repetitions(["cat", "dog", "cat", "cow", "cow", "cow"]) ➞ {"cow": 3, "cat": 2, "dog": 1}

count_repetitions([1, 5, 5, 5, 12, 12, 0, 0, 0, 0, 0, 0]) ➞ {0: 6, 5: 3, 12: 2, 1: 1}

count_repetitions(["Infinity", "null", "Infinity", "null", "null"]) ➞ {"null": 3, "Infinity": 2}

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