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<p>operation (for unlabelled graphs);<br/>
* <a href="page.php?w=graph_products">graph products</a> based on the <a href="page.php?w=cartesian_product">cartesian product</a> of the vertex sets:<br/>
** <a href="page.php?w=Cartesian_product_of_graphs">cartesian graph product</a>: it is a commutative and associative operation (for unlabelled graphs),<br/>
** <a href="page.php?w=Lexicographic_product_of_graphs">lexicographic graph product</a> (or graph composition): it is an associative (for unlabelled graphs) and non-commutative operation,<br/>
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