title: Include part of older version of committed file in new committed version of file
body: <p>My question concerns git and how to use it properly. My knowledge is very basic.</p>
  
  <p>I accidentally deleted a code chunk in my file, but only realized this after committing and pushing to github.
  Before realizing, I made additional intentional changes which I also committed and pushed.
  Now, I want to include the uninentionally deleted code chunk in the most recent (committed) version of my file.</p>
  
  <p>(How) is that possible to accomplish?</p>