How to make a DAG Strongly Connected?

How to make a Directed Acyclic Graph a Strongly Connected one by adding minimum number of edges into it?
Thanks

anryb wrote:
How to make a Directed Acyclic Graph a Strongly Connected one by adding minimum number of edges into it?A strongly connected graph has a path from every vertex A to evey vertex B but then a path from B to A exists as well violating the acyclic directed property of the graph.
Or is the graph allowed to lose its DAG property in the process?
kind regards,
Jos

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