Open a worksheet in document model, and input the next line in math model plot(x^2,x=-1..1,title="title"); and it will show a plot. Now select "title" in the quotation marks (not include quotation marks), type in "aabb" (not include quotation marks) and press enter, there will be an error. But if you select "title" including quotation marks, and change to "aabb" (including quotation marks), there will no problem.

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