def alternate_capitalization(s):
    """
    Given a string, capitalize the letters that occupy even indexes and odd indexes separately, and return as shown
    below. Index 0 will be considered even.
    :param s: a string value.
    :return: a list of strings with the first string starting with capitalization alternate and the other lower.
    """
    s = "".join(j if i % 2 else j.upper() for i, j in enumerate(s))
    return [s, s.swapcase()]