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In caementiciis autem structuris primum est de harena quaerendum, ut ea sit idonea ad materiem miscendam neque habeat terram commixtam. genera autem harenae fossiciae sunt haec: nigra, cana, rubra, carbunculus. ex his quae in manu confricata fecerit stridorem, erit optima; quae autem terrosa fuerit, non habebit asperitatem. item si in vestimentum candidum ea coniecta fuerit, postea excussa vel icta id non inquinarit neque ibi terra subsiderit, erit idonea.
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