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Alpha is a basic deterministic discovery algorithm that has been enhanced by Alpha*, Alpha++ and Alpha#. Alpha does an analysis of place, transition, and firing locally on each trace in the event log, which causes the time complexity of Alpha to be high for large event logs. In this paper, the Alpha-Tree (Alpha-T) algorithm is proposed to enhance Alpha's time complexity performance and quality of discovery. Based on generalized tuple pattern recognition (GTPR) inside the adjacency list treedoi:10.24507/ijicic.14.03.971 fatcat:n5gxk2rakrazhe7pentcym7uwm