I am a soft iron bar, which has been magnetized. Keep me in a strong horseshoe-magnet

I am a soft iron bar, which has been magnetized. Keep me in a strong horseshoe-magnet, and I become a powerful keeper of the soft iron, but lose my own magnetism. Demagnetize me, and I become soft iron again. Keep me in a strong keeper, and I become powerful, but lose my power when the keeper is demagnetized. Keep me in neither, and I keep my power, but it is very feeble. I can keep a keeper, but not myself. I can keep myself, but not a keeper. I can keep neither keeper nor myself, and then I have no power at all. Keep me in a strong keeper, and I can keep a keeper, but not myself. Keep me in myself, and I can keep neither keeper nor