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                  2.10.5 [Unit Object] command 
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            It registers more than one piece of chosen object as one unit. 
             
            
  
    
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            When starting this command, the command which was starting before it is automatically ended. 
            A procedure is shown below. 
            1. It chooses the object. (For the details, refer to The way of choosing
            object.) 
            2. When registering an unit 
            It starts [Unit Object] command. In this, it registers choice object as
            the unit.。 
            3. When canceling an unit 
            While pushing F5 key, It starts [Unit Object] command. In this, it registers
            choice object as the unit. 
            It registers maximum size object on the XY plane as the main object and
            it registers the other object as the sub object. The sub object, too, is
            automatically chosen when choosing the main object. 
            In [Base Line Edit[Vertex]] command and [Base Circle Edit[Vertex]] command,
            relative position relation in the unit isn’t changed. 
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