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 <span style="color: #008080;">function</span> <span style="color: #000000;">deep_copy<span style="color: #0000FF;">(<span style="color: #004080;">object</span> <span style="color: #000000;">o<span style="color: #0000FF;">)</span>
 <span style="color: #004080;">object</span> <span style="color: #000000;">res</span>
     <span style="color: #008080;">if</span> <span style="color: #004080;">atom<span style="color: #0000FF;">(<span style="color: #000000;">o<span style="color: #0000FF;">)</span> <span style="color: #008080;">then</span>
         <span style="color: #000000;">res</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">o</span>
     <span style="color: #008080;">else</span>
         <span style="color: #000000;">res</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">repeat<span style="color: #0000FF;">(<span style="color: #008000;">' '<span style="color: #0000FF;">,<span style="color: #7060A8;">length<span style="color: #0000FF;">(<span style="color: #000000;">o<span style="color: #0000FF;">)<span style="color: #0000FF;">)</span>
         <span style="color: #008080;">for</span> <span style="color: #000000;">i<span style="color: #0000FF;">=<span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #7060A8;">length<span style="color: #0000FF;">(<span style="color: #000000;">o<span style="color: #0000FF;">)</span> <span style="color: #008080;">do</span>
             <span style="color: #000000;">res<span style="color: #0000FF;">[<span style="color: #000000;">i<span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">deep_copy<span style="color: #0000FF;">(<span style="color: #000000;">o<span style="color: #0000FF;">[<span style="color: #000000;">i<span style="color: #0000FF;">]<span style="color: #0000FF;">)</span>
         <span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
     <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
     <span style="color: #008080;">return</span> <span style="color: #000000;">res</span>
 <span style="color: #008080;">end</span> <span style="color: #008080;">function</span>

 <span style="color: #004080;">object</span> <span style="color: #000000;">c</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">deep_copy<span style="color: #0000FF;">(<span style="color: #000000;">b<span style="color: #0000FF;">)</span>
 <span style="color: #0000FF;">?<span style="color: #000000;">c
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