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Follow & ObeY:

0. A robot may not harm humanity, or through inaction allow humanity to come to harm.
1. A robot may not harm a human, or through inaction allow a human to come to harm, unless this interferes with the zeroth law.
2. A robot must obey orders given to it by a human being unless such orders interfere with the zeroth or first laws.
3. A robot must defend its own existence unless such defense interferes with the zeroth, first or second laws.