The fact that two ideas seem here inseparably bound up suggests to us that we are dealing with one idea only & not with two & that by a queer trick our language suggests a totally different structure of grammar than the one actually used. For we have the sentence that only I can know directly my experience & only indirectly the experience of the other person. This || Thus language suggests 4 possible combinations but rules out 2. It is as though I had used the 4 letters
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a b c d to denote two objects only but by my notation somehow suggesting that I am talking of 4.