calculate the difference between each possible pair of data

Hey everyone,

So basically what i am trying to do is as follows: I have around 26 lists of data, call them A to Z. What I want to do is write a code that will calculate the difference between each possible pair of data, and if possible plot it as a matrix. E.g. if A has data: 3, 9, 24 and B has data: 1,5,13, when running my macro i will get a list: 1,4, 11. Then i want to do this for A vs C, A vs D, C vs D etc etc.

Obviously doing it manually would take a very long time, If you could tell me what kind of thing could work or any references it would be much appreciated. Thank you!