its ever-shifting as there are moving constraints but generally limitless. Posted on December 10, 2017 by Kenneth Udut Leave a comment its ever-shifting as there are moving constraints but generally limitless. [responsivevoice_button voice="US English Male"] Leave a comment Cancel reply Your email address will not be published. Required fields are marked *Comment Name * Email * Website Save my name, email, and website in this browser for the next time I comment. three + = 7 Leave a Reply