Hello @violandre01
Could you provide some data? so It’ll be easier for others in the forum to help. In the picture we cannot even see the column headers; ‘view >> wrap column header’ in table options is great for that.
Meanwhile, you can download and explore the solution to #justknimeit-8 , you may find similarities to your challenge:
You may consider to work with the ‘Histogram’ nodes as well, as they can perform the counting on string items.
BR