In the following items, each passage consists of six sentences. The first sentence (S1) and the final sentence (S6) are given. The middle four sentences in each have been removed and jumbled up. These are labelled P, Q, R and S. You are required to find out the proper sequence of the four sentences and mark accordingly on the Answer Sheet. 

S1: One of the odd-looking birds of the ocean is the penguin.
P: Penguins cannot fly.
Q: It is found in the cold regions of the Antarctic circle. 
R: Their wings have been changed into swimming flippers.  
S: They use them like oars. 
S6: With the aid of flippers they can dive into the water ..