anchor.diff:            </p>
           </li>
           <li>
  -          <h4><a href="http://backlogtool.com/git-guide/en/">Git Beginner's Guide for Dummies</a></h4>
  +          <h4><a href="https://backlogtool.com/git-guide/en/">Git Beginner's Guide for Dummies</a></h4>
             <p class='description'>
               This guide includes an introduction for complete beginners as well as hands-on tutorials for intermediate learners.
             </p>
  
positive.code:     <div class='column-right'>
        <ul class='books-list'>
          <li>
            <a href="http://www.amazon.com/Version-Control-Git-collaborative-development/dp/0596520123"><img src="/images/books/version-control-with-git@2x.jpg" width="107" height="140" /></a>
            <h4><a href="http://www.amazon.com/Version-Control-Git-collaborative-development/dp/1449316387">Version Control with Git, 2nd ed.</a></h4>
            <p class='description'>
              By Jon Loeliger &amp; Matthew McCullough
            </p>
          </li>
          <li>
            <a href="http://www.pragprog.com/titles/pg_git/pragmatic-guide-to-git"><img src="/images/books/pragmatic-guide-to-git@2x.jpg" width="107" height="162" /></a>
            <h4><a href="http://www.pragprog.com/titles/pg_git/pragmatic-guide-to-git">Pragmatic Guide to Git</a></h4>
            <p class='description'>
              By Travis Swicegood
            </p>
          </li>
          <li>
            <a href="http://www.packtpub.com/git-version-control-for-everyone/book"><img src="http://www.packtpub.com/sites/default/files/7522OS_mockupcover_bg_0.jpg" width="107"/></a>
            <h4><a href="http://www.packtpub.com/git-version-control-for-everyone/book">Git: Version Control for Everyone</a></h4>
            <p class='description'>
              By Ravishankar Somasundaram
            </p>
  
negative.code:     <div class='column-left'>
        <ul class='books-list'>
          <li>
            <a href="https://www.pragprog.com/titles/tsgit/pragmatic-version-control-using-git"><img src="/images/books/pragmatic-version-control@2x.jpg" width="107" height="128" /></a>
            <h4><a href="https://www.pragprog.com/titles/tsgit/pragmatic-version-control-using-git">Pragmatic Version Control Using Git</a></h4>
            <p class='description'>
              By Travis Swicegood
            </p>
  