In a certain city, there are seven streets going north-south and six streets going east-west. How many street paths start at the southwest corner of the city, end at the northeast corner of the city,...

Extracted text: In a certain city, there are seven streets going north-south and six streets going east-west. How many street paths start at the southwest corner of the city, end at the northeast corner of the city, and have the shortest possible length? .... There are such paths.