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Pila may have its ordinary sense of a pillar, in which case it is probably intended as the foundation of some building. Comp. Suet. Claud. 20 (speaking of the harbour at Ostia), congestis pilis superposuit altissimam turrim. Iactis in altum molibus Hor. 3 Od. 1. 34. Ante, as Wagn. remarks, shows the labour that has been spent on the masonry.