getReachibleNodes is a support function for inferring reachable nodes that have some directed path to a node
is an adjacency matrix of a following network of which its elements are binary: zero for no edge, and one for having an edge.
is a node in a graph that we want to find a set of nodes that can reach this target node via some paths.
This function returns a set of node IDs
followers that have some directed path to a node
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