ons.html" class="active"><strong aria-hidden="true">6.</strong> Actions on selections</a></li><li class="chapter-item expanded "><a href="conditional.html"><strong aria-hidden="true">7.</strong> Conditional expressions</a></li><li class="chapter-item expanded "><a href="matrices.html"><strong aria-hidden="true">8.</strong> Vectors and Matrices</a></li><li class="chapter-item expanded "><a href="functions.html"><strong aria-hidden="true">9.</strong> Functions</a></li><li class="chapter-item expanded "><a hre