which roller coasters have a capacity of 975 and lasts less than 56.0?
(AND amusement_parks.roller_coaster (AND (le amusement_parks.ride.duration 56.0^^http://www.w3.org/2001/XMLSchema#float) (JOIN amusement_parks.ride.capacity 975^^http://www.w3.org/2001/XMLSchema#integer)))