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#lang racket
(define max-r 2978)
(define max-c 3083)
(for/fold ([code 20151125] [r 1] [c 1]) ([i (in-naturals)] #:break (and (= max-r r) (= max-c c)))
(define new-code (modulo (* code 252533) 33554393))
(if (= r 1) (values new-code (add1 c) 1) (values new-code (sub1 r) (add1 c))))
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