Many supermarkets use loyalty or discount cards to keep track of who buys which items. How can graphs be used to model this relationship? Should the edges be directed or undirected? Should multiple edges be allowed? Should loops be allowed? Does this graph have any special properties?

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The Answer of Many supermarkets use loyalty or discount cards to keep track of who buys which items. How can graphs be used to model this relationship? Should the edges be directed or undirected? Should multiple edges be allowed? Should loops be allowed? Does this graph have any special properties?

Many Supermarkets Use Loyalty or Discount Cards to Keep Track