5216. 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: