>>> window_size = 3
    >>> pred = lambda *args: args == (0, 1, 2)  # 3 items passed to pred
    >>> substitutes = [3, 4] # Splice in these items
    >>> list(replace(iterable, pred, substitutes, window_size=window_size))
    [3, 4, 5, 3, 4, 5]

r: