Assertion: paper's material | /r/HasProperty | stacked
Facets:
value: by stepping back the layers
type: MANNER
Source sentences:
text: All bound material should be stacked, placed on racks, blocked, interlocked, or otherwise secured to prevent it from sliding, falling, or collapsing.
text: Bagged material must be stacked by stepping back the layers and cross-keying the bags at least every ten layers.