Before revision:  Items of size smaller or equal to 1 are presented in an iterative fashion and an algorithm has to decide whether to permanently include or reject each item into the knapsack without any knowledge about the rest of the instance.
After revision:  Items of size smaller or equal to 1 are presented in an iterative way and an algorithm has to decide whether to permanently include or reject each item into the knapsack without any knowledge about the rest of the instance.