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Answer: The arrangement of the burrows in the hell-layers is in the form of Indraka, श्रेणिबद्ध (Shrenibadh) and प्रकीर्णक (Prakirnak).
The one that is exactly in the middle of all the burrows of its layer is called the Indraka burrow. The burrows that are located in a row in all four directions and in the विदिशा (Vidisha) of this Indraka burrow are called श्रेणिबद्ध (Shrenibadh) burrows. Those that are scattered in between the श्रेणिबद्ध (Shrenibadh) burrows like scattered flowers are called प्रकीर्णक (Prakirnak) burrows.
This structure exists in each layer. In the first thirteen layers of the earth (hell), there are 13 Indraka burrows. In the other hells, there are 11, 6, 7, 5, 3, 1 Indraka burrows respectively, according to the number of layers. The total number of Indraka burrows is 46.
In the first layer of the first hell, there are 46-46 श्रेणिबद्ध (Shrenibadh) burrows in each direction and 48-48 in the विदिशा (Vidisha). From the second Indraka burrow to the last Indraka burrow located in the seventh hell, the number of श्रेणिबद्ध (Shrenibadh) burrows decreases by one each time, so that in the last Indraka burrow, there is only one श्रेणिबद्ध (Shrenibadh) burrow in each of the four directions, but no श्रेणिबद्ध (Shrenibadh) burrows are found in the विदिशा (Vidisha).
Question 20: What is the extent and shape of the burrows?
Answer: The Indraka burrows are only one yojana in extent. (13)