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Manuel's death is a great loss. He has been one of the most visible and vocal Petri net researchers and, for many years, a key member of our Petri Net Steering Committee. He introduced Petri nets to the Spanish research community and made Zaragoza the epicenter of the "structure theory for Petri nets". He also helped to promote Petri nets in manufacturing, performance analysis, and discrete events systems. We will miss him. My condolences to family, friends, and colleagues.

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