I have a schedule that lists personnel as the row heading and dates as
the column headings that form a grid that lists the shifts the employ
works on a particular date. The shifts are labeled "A", "B", etc.

I need a formula (I'm guessing countif) that counts the number of
times two employees work together. So, if "Bob" is the label for Row
1 and "Tom" is the label for Row 2, I need to know how many times they
both have the same shift (A, B or C) in the same column during the
month which is listed across 30 columns. I've tried several
variations of countif to no avail.

Thanks,
mb