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The Sandman Will Keep You Awake - The Loop
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CAO-2 is Lum, Benten, Ran and Oyuki's tyrannical robotic teacher from elementary space school. Benten and Lum try numerously with a forced Ran to gang up on him and get rid of him, but found him to be indestructible. CAO-2 is shaped like a gigantic blackboard eraser. Often throws itself at students putting chalk dust all over them.
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