public int LastIndexOf(RelationalListPair <T1, T2> item) => LastIndexOf(item.X, item.Y);
public bool Contains(RelationalListPair <T1, T2> item) => Contains(item.X, item.Y);
public void Remove(RelationalListPair <T1, T2> item)
{
Remove(item.X, item.Y);
}
public void Insert(RelationalListPair <T1, T2> item, int index)
{
Insert(item.X, item.Y, index);
}
public void Add(RelationalListPair <T1, T2> item)
{
Add(item.X, item.Y);
}
