question: What is the surface area of the Sahara Desert ?
answer: 9,400,000 square kilometres ( 3,600,000 sq mi )
turker_answer: The surface area of the Sahara Desert is 9,400,000 square kilometres ( 3,600,000 sq mi ) .
rule-based: The surface area of the Sahara Desert is 9,400,000 square kilometres ( 3,600,000 sq mi .