<span class="mdzsyn-number">0</span>}   <span class="mdzsyn-string">"C"</span>})

(<span class="mdzsyn-coresym">defn</span> <span class="mdzsyn-symbol">get-item</span>
  <span class="mdzsyn-string">"Get item at a specific point"</span>
  [<span class="mdzsyn-symbol">x</span> <span class="mdzsyn-symbol">y</span>]
  (<span class="mdzsyn-symbol">points</span> {<span class="mdzsyn-keyword">:x</span> <span class="mdzsyn-symbol">x</span> <span class="mdzsyn-keyword">:y</span> <span class="mdzsyn-symbol">y</span>}