The national sport, badminton, and is played wherever a net, real or makeshift, can be set up for players to thwack the shuttlecock acroseto each other.
You must use a real net when playing badminton. 
mnli hypothesis: You must use a real net when playing badminton.  premise: The national sport, badminton, and is played wherever a net, real or makeshift, can be set up for players to thwack the shuttlecock acroseto each other.