The current invention allows a user to evaluate web pages, emails, or software across different operating systems without requiring the user to have the operating system being tested. Each climbing bracket has a joint arranged between a first climbing bracket and a second climbing bracket. The dispersion has an oil portion having a polysiloxane andor a hydrocarbon oil. This information is saved, and used to control a device for mechanically excavating material from the railroad bed sides without damaging the embedded cables or tubes and grading the railroad bed. The polycarbonate exhibits relatively high glass transition temperature and improved adhesion to metals. That is the multi-subarray sub-space fitting method.