Assertion: sphinx's construction | /r/CapableOf | date to the 6th millennium bc
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text: According to Schoch, the area has experienced a mean annual rainfall of approximately one inch (2.5 cm) since the Old Kingdom (c. 2686–2134 BC), such that, since Egypt’s last period of significant rainfall ended between the late fourth and early 3rd millennium BC, the Sphinx’s construction must date to the 6th millennium BC or 5th millennium BC.