egisters 1 and 2 when we start.  Again, our program moved the contents of R2 onto the end of R1, emptying R2.  You should want to change the opening contents of R1 and R2 in the cell above before going on.</p>
<p id="content-parsing">If you have an interpreter handy, you can parse this program and also get glosses.</p>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">parse</s