A multistage process for the homo or copolymerization of ethylene carried out in the presence of a catalyst system comprising at least one polymerization catalyst based on a late transition metal component having a tridentate ligand which bears at least two ortho. A first wall and a second wall are joined at a corner edge. The new heuristic is based on counting the number of times an end-node of a particular byte-string is visited, while not incrementing a count for nodes storing characters in the middle of the byte-string as often as each time such nodes are visited. The programmable logic hardware includes a plurality of basic logic elements and electrically configurable interconnections. Use of boron steel means that the device can be made by cold forming. The first sub memory block has a management area for storing a management information including linking information between the first sub memory block corresponding sub memory blocks of other memory blocks.