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第一百零八条 海上旅客运输合同中含有下列内容之一的条款无效：
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The last thing on our feature list to implement is deletion: using Backspace should cause one character before the cursor to disappear, and move the cursor left by 1. This can be done naively by inserting an
The dashed circle shows the current best distance. As the algorithm finds closer points, the circle shrinks, which causes more subtrees to fail the "could contain a closer point?" test and get pruned. The search usually gets cheaper as it progresses.