Question: Write a function, neighbours (z, x, y), that takes in an adjacency matrix representation of a graph, z, and a vertex x, and a vertex
Write a function, neighbours (z, x, y), that takes in an adjacency matrix representation of a graph, z, and a vertex x, and a vertex y, and returns the list of vertices that are neighbours of x but not neighbours of y.
Note: a neighbour of a given vertex is directly connected to that vertex by an edge. PYTHON
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