A method and system for reliably performing extra-long operations in a reliable state-full system. Based on various attributes associated with the polygon and its surroundings, modification of the location of the edge segments may conditionally occur. The invention further relates to a wheel, particularly having such a cover. opened within six months, within twelve months, and over twelve months ago. Additionally, the gas-generating apparatus of the present invention includes a fuel introducing system that has a fuel transporting system that is pressure regulated. The bands are joined, by sealing, in the joining station, in order to obtain a third, multi-layer band fed along a third feeding path.