S1:	The study of speech disorders due to brain injury suggests that patients can think without having adequate control over their language.
P :	But they succeed in playing games of chess.
Q :	Some patients, for example fail to find the names of objects presented to them.
R :	They can even use the concepts needed for chess playing, though they are unable to express many of the concepts in ordinary language.
S :	They even find it difficult to interpret long written notices.
S6:	How they manage to do this we do not know.

The Proper sequence should be: