I followed chris1234 instructions on looking up previous grade material. However, somehow I did not find the 'set' concept under grade 1. i.e. Which is a set?, Empty set, Equal sets, Union of Sets. Neither under Grade 2 for: Finding sets of numbers satisfying two inequalities, Set notation for finding sets .e.t.c.

In short, I did not find the Set Concept under grade 1 or 2. Can anyone assist me in locating this topic? I presume that the Lesson Contents are completely covered in the program.