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Content def forward(rotated_list, current_value): # not using valueerror exception handling here: the data in the app should be correct. current_index = rotated_list.index(current_value) if current_index == len(rotated_list) - 1: return rotated_list[0] else: return rotated_list[current_index + 1] def backward(rotated_list, current_value): current_index = rotated_list.index(current_value) if current_index == 0: return rotated_list[len(rotated_list) - 1] else: return rotated_list[current_index - 1]