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Let V be a finite subset of the vertex set of the infinite 2-dimensional integer lattice (see Figure 1.27), and let d be an odd positive integer.

Let V be a finite subset of the vertex set of the infinite 2-dimensional integer
lattice (see Figure 1.27), and let d be an odd positive integer. Denote by G the
graph with vertex set V in which two vertices (x1, y1) and (x2, y2) are adjacent
if their euclidean distance is equal to d. Show that G is bipartite

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