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: