Novel five-membered heterocyclic amidines, their preparation and use as competitive inhibitors of trypsin-like serine proteases, especially thrombin and kininogenases such as kallikrein. There is also provided an apparatus for texturing a metal sheet or strip. In one implementation, the new MAC destination address is transmitted from the IRC to the dequeuing logic by transmitting pairs of adjacent words through the switch output queues. The pyrophosphate based on content preferably comprises between about 0. The method further includes monitoring the physical location for faults according to the monitoring routine.