That was a little tool I made several years ago when I was new to making rubs. the purpose for it was in designing rubs from scratch to get flavors that go together.
Where there is an X at the intersection of ingredients means those two ingredients go together. So what you can do is pick a flavor you want, say Garlic for example, and select it by going to the Garlic column (column AO) and clicking the filter drop-down and selecting "X". After doing this, all of the ingredients listed in the rows on the left side are those that pair with Garlic. Say you also want Basil to go with that Garlic. Go to the Basil column and filter on "X" and now what is listed are ingredients that pair up with Garlic and Basil. You can keep on going as far as you can until you run out of options.
I hadn't used it in quite some time and ran across it on my PC recently, and decided I should share it in case it helped anyone else who would like to experiments and see what adding new flavors to things would be like, without having to learn through trial and error what does and does not work together.
Also, if you find a flavor pairing you think works well together that is not shown on this, all you have to do is add the ingredient as both a row and a column (if it's not already there) and then put an "X" on the things you know it pairs well with. I don't presume to have included every flavor pairing known to man on there, just a whoel bunch known to work from my experiences, and from the book "Herbs & Spices" by Jill Norman.
