assumes is done let's say that is a sequence of symbols let's say there's only 26 letters and nothing else in that file of course there's other symbols too but you could just look at the frequencies of each of those letters you could then look at the entropy encoding or look at the entropy and say okay this is the entropy and now if I want to compress this by doing each of my 26 letters a bit sequence as its encoding what's the best I can possibly do I can actually find that number and you'll find that it is gonna be more than that