var element

Then he turned to the blackboard and picked up the chalk. After a few moment's thought, he wrote E = m c2. The teacher looked pleased.

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<p>Then he turned to the blackboard and picked up the chalk. After a few moment's
thought, he wrote <var>E</var> = <var>m</var> <var>c</var><sup>2</sup>. The teacher
looked pleased.</p>

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