In these questions, the first and last sentences of the passage are numbered 1 and 6. The rest of the passage is split into four parts and named P, Q, R, and S. These four parts are not given in their proper order. Read the sentences carefully and find out the correct sequence of the sentences. 

S1: Venice is a strange and beautiful city in the north of Italy.

P : There are about four hundred old stone bridges joining the island of Venice.

Q : In this city, there are no motor cars, no horses, no buses.

R : These small islands are near one another.

S : It is not an island but a hundred and seventeen islands.

S6: This is because Venice has no streets.