def drop_duplicates(seq):
    """Function that given an array or array of arrays *seq*, returns an
    array without any duplicate entries. There is no guarantee of which
    duplicate entry is dropped.

    """
    noDupes = []
    seq2 = sum(seq, [])
    [noDupes.append(i) for i in seq2 if not noDupes.count(i)]
    return noDupes