<main>Main Content</main>
<aside>
  <p>Item one</p>
  <p class="sidebar-chunk">Item two</p>
  <p>Item three</p>
  <p class="sidebar-chunk">Item four</p>
  <p>Item five</p>
</aside>
body { display: flex; }
main { width: 50%;}
aside { display: flex;
        flex-direction:column;}
.sidebar-chunk { order: 2; color: red;}
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