A valve system for ensuring well closure upon exposure to a predetermined condition even where a well access line is disposed through the valve. The one or more processors are configured to substitute a k-edge feature in the determined spectral attenuation curves with an approximation of the determined spectral attenuation curves lacking the k-edge feature. At least one of the individual routers responds to the SCP with a destination for the call. The invention provides a third group of sub-assemblies for retrofit. The method may additionally comprise communicating a message to the caller during the predetermined delay. The interleaved bits are collected into the modified circular buffer.