Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Historic City of Meknes' has mentioned 'Grain' in the following places:
Occurrence Sentence Text Source
[23] In reality, the number of Christian slaves was likely closer to a few thousand at most and the chambers popularly called "prisons" were actually storage rooms for grain and supplies.
Grain was originally delivered to the building by mules who climbed onto a roof terrace and dropped the grain directly into holes pierced above each vaulted chamber.