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		Ubuntu 12.04
 LibreCad  ver. 2.07
  Layer List as 4 icons next to layer name, from left to right first is the eye then the lock the printer next there this icon I don't know what it does.
 If I make a line from 0,0 to location 50,50 and if I  click on this symbol after enter the line the line goes right out of the screen.
 Please explain what this symbol does.
 Thank you  
	
	
	
	 
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