20.
S1: Hiuen-tsang became a Buddhist monk at the age of twelve and soon discovered that the Buddhist texts available in China were insufficient.
S6: But he was on a quest and returned after a while to his motherland with a rich collection of texts, documents and relics.
P: Wherever he went, he was asked by the local rulers and monks to stay in the place.
Q: He entered India through Kashmir, where he spent some time in Srinagar.
R: He therefore decided to go on a pilgrimage to India to collect further material.
S: From India, he attempted to go to Ceylon, but gave up the attempt.
The correct sequence should be