def normalised_cooperation(cooperation, turns, repetitions):
    """
    The per-turn normalised cooperation matrix for a tournament of n repetitions.

    Parameters
    ----------
    cooperation : list
        The cooperation matrix (C)
    turns : integer
        The number of turns in each round robin.
    repetitions : integer
        The number of repetitions in the tournament.

    Returns
    -------
    list
        A matrix (N) such that:

            N = C / t

        where t is the total number of turns played in the tournament.
    """
    turns = turns * repetitions
    return[
        [1.0 * element / turns for element in row]
        for row in cooperation]