This function finds the common neighbours between two nodes from a graph. It returns an empty vector of length 0 if there is no common neighbours.
1  | common_nbrs(graph, x, y)
 | 
graph | 
 A graph that is stored in an adjacency matrix.  | 
x | 
 A node in graph.  | 
y | 
 A node in graph that is different from x.  | 
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