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if __name__ == '__main__':
        arrays = [
                [0,0,0,0,0],[0,0,0,0,1],[0,0,0,1,0],[0,0,0,1,1],
                [0,0,1,0,0],[0,0,1,0,1],[0,0,1,1,0],[0,0,1,1,1],
                [0,1,0,0,0],[0,1,0,0,1],[0,1,0,1,0],[0,1,0,1,1],
                [0,1,1,0,0],[0,1,1,0,1],[0,1,1,1,0],[0,1,1,1,1],
                [1,0,0,0,0],[1,0,0,0,1],[1,0,0,1,0],[1,0,0,1,1],
                [1,0,1,0,0],[1,0,1,0,1],[1,0,1,1,0],[1,0,1,1,1],
                [1,1,0,0,0],[1,1,0,0,1],[1,1,0,1,0],[1,1,0,1,1],
                [1,1,1,0,0],[1,1,1,0,1],[1,1,1,1,0],[1,1,1,1,1]]

        # Iterate through each possible initialization vector
        for array in arrays:
                # Calculate the resulting array up to 64 places
                for i in range(200):
                        array.append((array[i] + array[i+1]) % 2)

                # Find equal consecutive arrays
                for period in range(5,100):
                        array1 = array[0:period]
                        array2 = array[period:2*period]
                        # If match, print out array and period
                        if array1 == array2:
                                print array[0:5], '=', array1, "; Period =", period
                                break