I think you're using a domain specific definition of a graph. These certainly meet the English definition of a graph[1]. [1] https://www.google.com/search?q=d

I think you're using a domain specific definition of a graph. These certainly meet the English definition of a graph[1]. [1] https://www.google.com/search?q=define+graph https://www.google.com/search?q=define+graph