Hi again, I am stuck on another question so if anyone can help me that would be greatly appreciated.

For part a I think the matrix is:

because the ordered pairs are:

(a,a), (a,c), (a,d), (a,e), (b,b), (b,d), (b,e), (b,f), (c,c), (c,e), (c,f), (d,d), (d,f), (e,e), (f,f)

Is this correct?

And I can't seem to get anything for part b and c. Can anyone help me here?

Thanks