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Hmm, maybe the countries on the obelisk aren't just arranged in a specific order for no reason? And this order is the one in which the stones need to be inserted. Either it starts from the central statue, then goes to the lower left corner (south), then the upper left (west), from there to the upper right (north), and then to the lower right (east). Alternatively, it starts right on the southern statue (closer to the center) and ends on the central one.