private:
MagnetAccessory &add_accessory(unsigned, MagnetAccessory::Type, MagnetAccessory::Symbol);
void set_accessory_state(unsigned, MagnetAccessory::Type, unsigned);
private:
MagnetAccessory &add_accessory(unsigned, MagnetAccessory::Type, MagnetAccessory::Symbol);
void set_accessory_state(unsigned, MagnetAccessory::Type, unsigned);