/// <summary>
/// Determines if this bag is a subset of another ba11 items in this bag.
/// </summary>
/// <param name="otherBag">Bag to compare to.</param>
/// <returns>True if this is a subset of <paramref name="otherBag"/>.</returns>
/// <exception cref="InvalidOperationException">This bag and <paramref name="otherBag"/> don't use the same method for comparing items.</exception>
public bool IsSubsetOf(Bag <T> otherBag)
{
return(otherBag.IsSupersetOf(this));
}
