def prune_items(items, marked_items):
    pruned_items = []
    for item in items:
        if (item not in marked_items):
            pruned_items.append(item)
    return pruned_items
def prune_items(items, marked_items):
    pruned_items = []
    for item in items:
        if (item not in marked_items):
            pruned_items.append(item)
    return pruned_items