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Over several decades Manuel has been tremendously supportive to the worldwide research community working on Petri nets. In particular, he has made great contributions to the organisation of Petri Nets conference series and the activities of its Steering Committee. He will be deeply missed as a friend and colleague with whom it was always so rewarding to meet and discuss science as well as ordinary life related matters.

My sincere condolences to Manuel's family and to his close friends during this difficult time.

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