The dimensions of each smaller rectangle will be $\Delta x = 1$ and $\Delta y = 2$. The lower right corners of these rectangles are $(1,2), (1,4), (2,2),$ and $(2,4)$. Now we can compute the Riemann sum:
$$V \approx \sum_{i=1}^{2} \sum_{j=1}^{2} f(x_{i}, y_{j})
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