">(</span><span class="nam">yy</span> <span class="op">+</span> <span class="nam">dy</span><span class="op">,</span> <span class="nam">xx</span> <span class="op">+</span> <span class="nam">dx</span><span class="op">,</span> <span class="nam">pixel_grid</span><span class="op">)</span> <span class="key">for</span> <span class="op">(</span><span class="nam">dy</span><span class="op">,</span> <span class="nam">dx</span><span class="op">)</span> <span class="key">in</span> <span class="nam">_NEIGHBORS</span>&nbs