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8 lines
438 B
8 lines
438 B
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Exercise 2.51: Define the below operation
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for painters. Below takes two painters as arguments. The resulting
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painter, given a frame, draws with the first painter in the bottom of the frame
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and with the second painter in the top. Define below in two different
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ways—first by writing a procedure that is analogous to the beside
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procedure given above, and again in terms of beside and suitable
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rotation operations (from Exercise 2.50).
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