VN

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   .-VN--=--NO------.   
>>-+----------------+------------------------------------------><
   |        .-NO--. |   
   '-VN--=--+-----+-'   
            '-YES-'     

Specifies that a virtual node is to be predefined.
VN=NO
Specifies that no virtual node is to be predefined.
VN=YES
Specifies that a virtual node is to be predefined.