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#! /usr/bin/racket
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#lang racket/base
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(define (sum term a next b)
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(define (iter a result)
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(if (> a b)
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result
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(iter (next a) (+ (term a) result))))
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(iter a 0))
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(sum (lambda (x) x) 0 (lambda (x) (+ x 1)) 3)
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