PREVIEW
... st was the internal factor.
The second was the external factor.
The internal factor was the strength of the physical body, and the degree of understanding of the Space Rules, among other things.
Normally, the deeper the understanding of the Space Rules, the more core space models would be comprehended, and thus the larger the inner world would grow.
As for physical strength? It was difficult to significantly enhance physical strength in a short period of time.
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