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$I N F R A R O A D R A I_{r, t} = 100 * e^{- 3.558 + 1.328 * l n (\frac{G D P P C_{r, t} * 1000}{L A N D A R E A_{r, t}}) + 0.239 * l n (I N F R A R O A D_{r, t} * \frac{L A N D A R E A_{r, t} * 1000}{P O P_{r, t}})}$

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