Further Examples: PageWidth

This opens a stream, specifying that the page width is 20 characters.

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This writes out an expression to the stream.

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This closes the stream.

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The lines in the expression written out are all broken so as to be at most 20 characters.

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"x^5 + 5*x^4*y +

10*x^3*y^2 +

10*x^2*y^3 +

5*x*y^4 + y^5"

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