The fence building system which provides for one or more corner posts and H-brace fence sections employs standard system components and a couple of general fence tools. The present invention also relates to processes for the synthesis of 5-fluoro-1H-pyrazolo3,4-bpyridin-3-amine derivatives. Semiconductor elements are disposed on the upper surface of the first substrate in the device area. The verification number is generated by using an authorization algorithm having the parameters and a key as A-algorithm inputs. Since all the actions are located together, the actions of all ACEs may be applied to a packet using a single ACL lookup. In use the ellipsometer determines the product of thickness and optical constant, and the oscillator system changes frequency of oscillation proportional to the thickness of material deposited upon a surface of an element therein.