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Propan burner heats air for hot-air ballon, Moselle hot-air ballon festival, Trier-Foehren, Foehren, Rhineland-Palatinate, Germany, Europe Stock Photo - Alamy
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Propan burner heats air for hot-air ballon, Moselle hot-air ballon festival, Trier-Foehren, Foehren, Rhineland-Palatinate, Germany, Europe Stock Photo - Alamy
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