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<!DOCTYPE html> <html lang="en"> <head> <title>Example of HTML subscript and superscript</title> </head> <body> <p>The chemical formula of Water is: H<sub>2</sub>O</p> <p>The chemical formula of Carbon Dioxide is: CO<sub>2</sub></p> <p>The equation of mass-energy equivalence is: E=mc<sup>2</sup></p> </body> </html>
