/// <summary>
/// Adds the specified position to the relation. Returns true if it was added, false if it was already present.
/// </summary>
public bool Set(P1 p1, P2 p2, P3 p3, P4 p4)
{
return(Set(Position4.Create(p1, p2, p3, p4)));
}
/// <summary>
/// Returns whether the relation contains the specified position.
/// </summary>
public bool Contains(P1 p1, P2 p2, P3 p3, P4 p4)
{
return(Contains(Position4.Create(p1, p2, p3, p4)));
}