A system, method and computer program product for executing a cache replacement algorithm. The first peeling step is to pull up a pair of opposite portions of a lens sheet, which is formed on a forming mold, to peel partially the lens sheet from the forming mold. The spring contacts each form a first inclined lead in surface projecting into the socket in the plug-in direction. A retaining bolt is placed through all of the grate bars including the curvatures of the pools’edge and the bolts are fastened therein. During a de-icing step, at least one de-icing means is activated temporarily in order to de-ice the de-icing zones in succession and in a given cycle.