We give an algorithm that, for a given value of the geometric genus p(g), computes all regular product-quotient surfaces with abelian group that have at most canonical singularities and have canonical system with at most isolated base points. We use it to show that there are exactly two families of such surfaces with canonical map of degree 32. We also construct a surface with q =1 and canonical map of degree 24. These are regular surfaces with p(g) = 3 and base point free canonical system. We discuss the case of regular surfaces with p(g) = 4 and base point free canonical system.
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