def is_parallel(last, current):
    """
    Returns True if the motion between last and current notes is parallel.
    """
    parallel = False
    if last[0] - current[0] < 0 and last[1] - current[1] < 0:
        parallel = True
    elif last[0] - current[0] > 0 and last[1] - current[1] > 0:
        parallel = True
    return parallel