I have a data set with 30 columns and multiple rows (some cells have no data). I would like to be able to facet the columns in groups.

    1 2 3 4.....  

Row1 A B C D
Row2 E A D F
Row3 Q A B H

Given the above data I would like the facet to retun the number of instances in a group of columns. For the first three columns I need the facet to return:
A - 3
B - 2
C - 1
D - 1
E - 1
Q - 1

I have tried to combine columns when I loaded the data but the individual data was grouped as well. This is not the desired outcome. For example:
ABC - 1
EAD - 1
QAB - 1

Thanks in advance.