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Memoize Thunk
(define (force-it obj)
(if (thunk? obj)
(define-in-environment (name thunk-exp) list('evaluated-thunk ((actual-value (thunk-exp obj) (thunk-env obj))))
(define (evaluated-thunk? obj)
(eq? (car obj) 'evaluated-thunk))
(define (thunk-value evaluated-thunk) (cadr evaluated-thunk))
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