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In China ( Kaifeng and Zhengzhou ) he worked to develop a charcoal powered car to aid in China 's energy independence , which had been an issue during world war I. In 1931 , he created an internal combustion engine powered by charcoal and mounted it in an automobile .
 location: Kaifeng; location: Zhengzhou
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 location: Kaifeng; location: Zhengzhou