Help with possible Nested IF?

Link to Document:

http://filebox.vt.edu/users/kkhan/Excel/ExcelHelp2.xls
My current Formula:

=IF(OR(AND(EXACT(A6,A7),EXACT(B6,B7),EXACT(D6,D7),EXACT(E6,E7),EXACT(F6,F7)),AND(EXACT(A7,A8),EXACT(B7,B8),EXACT(D7,D8),EXACT(E7,E8),EXACT(F7,F8))),G8,0)
What i want to be able to do is say when the
#6 rows = #7 rows then use G6
But when
#7 rows = the #8 rows then use G8

As I have it now I can only specify one TRUE which is to use cell G8.

Thanks!