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Exercise 3.55: Define a procedure
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partial-sums that takes as argument a stream
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S
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and returns the
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stream whose elements are
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0
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,
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0
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+
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S
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1
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,
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S
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0
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+
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S
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1
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+
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S
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2
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,
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…
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.
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For example, (partial-sums integers) should be the
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stream 1, 3, 6, 10, 15, ….
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