Here is the question.

Let S={1,2,3,4}. With respect to the lexicographic order based on theusual less than relation:

a)find all pairs in S x S less than (2,3)

ans: (1,1),(1,2),(1,3),(1,4),(2,1),(2,2)

b) all pairs in S x S greater than (3,1)

ans: (3,2),(3,3),(3,4),(4,1),(4,2),(4,3),(4,4)

c) draw the Hasse Diagram of poset (SxS,≼)

I understand posets and Hasse Diagrams but I am having a hard time visualizing part c.