I am not sure that would count as working on the set. It looks like iteration. From the article: a) 1___ 2___ 3___ 4___ 5___ 6___ 7___ 8___ 9___ Thinks of th

I am not sure that would count as working on the set. It looks like iteration. From the article: a) 1___ 2___ 3___ 4___ 5___ 6___ 7___ 8___ 9___ Thinks of them as a set or subsets of entities and operates on those, or specifies them with plurals. Example: Buy all of the books that are red. b) 1___ 2___ 3___ 4___ 5___ 6___ 7___ 8___ 9___ Uses iteration (i.e. loop) to operate them explicitly. Example: For each book, if it is red, buy it. In your case it looks like you are operating on each item and not on the set.