Once there was a Baker who wanted to integrate all recipes of bread into a master recipe. And so, instead of writing something like “ Add 2 cups of water 4 tsp of yeast and salt and 6 cups of wheat flour” he wrote: "Add any amount of flour made from any grain to any amount of water, salt and yeast, plus anything else. You may also omit water, and use milk, yogurt, soup, coffee, tea or any flavored liquid instead.”
Now, this is not a master recipe. Nor is it a system for baking bread. It doesn’t help you make bread. It simply catalogs possibility. A system that helps someone do or make something helps him limit the possible outcomes of his activity.