Read the following group of sentences. The 1st and the last sentences are numbered 1 and 6, the rest are numbered P,Q,R,S. Arrange these four sentences in proper order to form a meaningful paragraph/sentence.
1. Architecture began
P. to build their own shelters
Q. on readymade ones
R. when early people started
S. rather than relying
6. such as trees and caves
1
RPSQ
2
PRQS
3
RQPS
4
PSQR