Input (grade 13): Architectural and design experts began planning and visiting the site between April and May 2003, and the area was transformed from swampland to international racetrack within 18 months with a team of 3000 engineers working around the clock.
Output (grade 8): Architectural and design experts began visiting the site by April 2003. The site was transformed from swampland to an international racetrack in 18 months.