ROBOTS: FRIEND OR FOE?

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Across
  1. 2. - Enhancing or increasing in size or scope (10 letters).
  2. 3. - A set of rules or steps for solving a problem, often used in computing (9 letters).
  3. 4. - To take the place of something or someone (9 letters).
Down
  1. 1. - Able to operate independently without human intervention (10 letters).