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Continue to ChatOn semigroup presentations and efficiency - https://avesis.cu.edu.tr/yayin/f621df88-1b28-4ec7-aa29-ba3e539c59e3/on-semigroup-presentations-and-efficiency
On semigroup presentations and efficiency - https://avesis.cu.edu.tr/yayin/f621df88-1b28-4ec7-aa29-ba3e539c59e3/on-semigroup-presentations-and-efficiency