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Hadamard cancellation rule

4

Unless I am missing it there is no "Hadamard cancellation" implemented. Consider the following graph: ``` g = zx.Graph() v0 = g.add_vertex(zx.VertexType.BOUNDARY, 0, 0) v1 = g.add_vertex(zx.VertexType.H_BOX, 0, 1) g.add_edge((v0,...