public override ImmutableCollection <T> RemoveFront()
{
if (m_left.Size > 1)
{
return(new NormalCollection(m_left.RemoveFront(), m_middle, m_right));
}
else if (!m_middle.IsEmpty)
{
return(new NormalCollection(m_middle.Front, m_middle.RemoveFront(), m_right));
}
else if (m_right.Size > 1)
{
return(new NormalCollection(new One(m_right.Front), ImmutableCollection <MiniCollection> .Empty, m_right.RemoveFront()));
}
else
{
return(new SingleCollection(m_right.Front));
}
}
