The relay has a movable first contact, a second contact, and an actuating element operatively connected with an armature of the relay. A state of charge is determined at a first instant of time and at a second instant of time. The X-ray image is subdivided into image regions and each time the brightest image region is successively separated from the remaining image regions in an iterative method if its mean grey value forms an indication of the presence of direct radiation in the relevant image region. Responsive to the user’s selection of a group, the tools can present content, render enclosures, and alter traits of the content items in the group. Some meta-nodes may identify instructions of a specific type. The polyurethane foam is designed so that the number of cell per inch thereof is 30 or more and 60 or less and an open ratio of cell walls thereof is 3% or more and 50% or less.