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      <title>Back Popup Menu</title>
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      <div class="title_topic3" id="xps10_pagetitle">Back Popup Menu</div>
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      <p class="para_topic">When object selection is in progress and you have selected at least one object, the system enables the following special Back options:</p>
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               <p class="para_th">Option</p>
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               <p class="para_th">Description</p>
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               <p class="para_td">Single Back</p>
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               <p class="para_td">Deselects the last object selected in single select mode. In chaining mode, if you have selected only the chain start, this option deselects the selected object and allows you to reselect the chain start; if you have selected both chain start and chain end, this option deselects all of the chain segments and returns to single select mode.</p>
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               <p class="para_td">Double Back</p>
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               <p class="para_td">Deletes selection of the current boundary and returns to the previous menu.</p>
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               <p class="para_td">Triple Back</p>
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               <p class="para_td">Deletes all selections (boundaries) and returns to the previous interactive step.</p>
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      </table><br><p class="para_topic">You cannot select any object twice in a row. This feature is useful when the screen is crowded. If you miss selecting the object you want, select Back and select again. You cannot select the rejected object a second consecutive time. </p>
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