/// <summary>
/// Tests whether an <see cref="Edge" /> is contained in this subgraph.
/// </summary>
/// <param name="e">The <see cref="Edge" /> to test.</param>
/// <returns><c>true</c> if the <see cref="Edge" /> is contained in this subgraph.</returns>
public bool Contains(Edge e)
{
return(edges.Contains(e));
}