Identify Values Specific To Defined Groups Of Columns?

I have these kind of matrices (below) and I'd like to identify unique values specific to different groups of columns:

[Code] .........

For instance, in the example above, if we decide that A, B, C are "Group 1" and D, E, F are "Group 2", and that the values in rows 1, 2, 3 are independent (i.e., "x" in "1" is not comparable to "x" in "2", etc):
- In condition (row) 1: "x" is a specific value only found in Group 1
- In condition 1: "y" is a specific value only found in Group 2
- In condition 2: "x" is a value found in majority in Group 1
- In condition 3: no specific value can be associated to Group 1 or 2.

What I would like to get is a measure of whether:
(1) there are values over-represented in one of the groups, or 100% specific to one group.
(2) what are these values
(3) if multiple values are a bit tricky, then: what is the value which is the most over-represented in one group compared to the other (the maximum being 100% in one group and 0% in the other)