A highly interactive directory tree can be provided through a client user interface. A dielectric layer of a semiconductor device is patterned with a dual damascene pattern having a first pattern and a second pattern. Use of a sheet of expanded metal according to the invention for supporting a bundle of parallel tubes. The generator can be distantly located from the rotors and rotor shaft, for example, on the ground adjacent to the support tower supporting the rotors and rotor shaft. Crosslinker groups formed with these triazine moieties provide chemically reversible crosslinks, which allow such otherwise intractable crosslinked polymeric materials to be recycled andor reprocessed by removalreversal of crosslinks.