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(obj-put this-obj 'start-index (lambda (self) start-index))
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(obj-put this-obj 'set-start-index!
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(lambda (self new-start-index)
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(set! start-index new-start-index)
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(obj-put this-obj 'end-index (lambda (self) end-index))
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(obj-put this-obj 'set-end-index!
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(lambda (self new-end-index)
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(set! end-index new-end-index)