If sheet2 cols A and C match the value in sheet1 cols H and I, I want to
return the number of unique values in sheet 1 column A. Can anyone provide a
formula for accomplishing this:

The following example should yield a result of 2 for the Arenas/Bibby
combination because there are two rows in sheet1 where Arenas is in colH and
Bibby in colI, AND the date in colA is unique (10/29/08 and 10/30/08):

sheet2
colA colC
Arenas Bibby


sheet1
colA colH colI
10/29/08 Butler Simmons
10/29/08 Arenas Bibby
10/29/08 Thomas Brown
10/30/08 Arenas Bibby
10/30/08 Stevens Hale
10/30/08 Arenas Bibby
10/30/08 Stevens Simmons
10/31/08 Arenas Simmons


Thanks,
Bob