def get_not_unique_values(array):
s = np.sort(array, axis=None)<EOL>s = s[s[<NUM_LIT:1>:] == s[:-<NUM_LIT:1>]]<EOL>return np.unique(s)<EOL>
Returns the values that appear at least twice in array.

    Parameters
    ----------
    array : array like

    Returns
    -------
    numpy.array