Update 2021-03-09-composition.markdown

Author: bcb

docs/_posts/2021-03-09-composition.markdown

@@ -10,8 +10,8 @@ the little problems, we can combine the solutions to solve bigger problems.
 
 Why do we break down problems? This is due to the limitations of the human mind --
 we can only deal with a small number of concepts at a time, so we break down
-problems, and break them down again until they're just the right sized chunks that
-we can mentally digest.
+problems, and break them down again until they're just the right size that
+we can mentally digest them.
 
 A well-decomposed problem will produce the most elegant solution.