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<h3>
<span class="eraser b"> Erase </span>Boundary Crossing Marks
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Leave space to let the algorithm find the exact edge. <span class="bg b">Red</span> and <span class="fg b">green</span> should never touch.
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Use the <span class="yo-data-uri sword-tool-icon-svg"></span> <a href="/tutorials/scalpel">scalpel</a> for precision control of the boundary.
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