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| #lang scheme | |
| (define (rbp n) | |
| (define (help canBeRed n) | |
| (if (= n 0) 1 | |
| (if canBeRed (+ (help #t (- n 1)) (help #f (- n 1))) | |
| (help #t (- n 1))))) | |
| (help #t n)) |
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