private void Awake()
    {
        if (instance == null)
        {
            instance = this;
        }
        else if (instance != this)
        {
            Destroy(this.gameObject);
        }
        DontDestroyOnLoad(this.gameObject);

        m_EntityMap = new Dictionary <int, PlayerBase>();
    }
 // Same as ' = ' operator
 public EntityManager_CH4 IsEqual(EntityManager_CH4 em)
 {
     return(em);
 }