Task: Information Extraction
Input (English):  "process paragraph : : A red giant star forms from an existing star. Formation occurs when the star runs out of hydrogen fuel. Hydrogen atoms are combined together to form helium atoms. Energy produced by helium fusion causes the star to expand. A red giant star is the last stage of stellar evolution. ", "event : Formation occurs when the star runs out of hydrogen fuel.", "entity : hydrogen fuel" 
Output (English):  not exist