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आपोऽथाद्भ्यः सलिलं तस्य मध्ये उभौ देवौ शिश्रियातेऽन्तरिक्षे ।
In plain words
First the waters. Then, out of the waters, the flood. And in the middle of it the two gods have settled and taken their rest, there in the open space between.
Close to the Sanskrit
The waters; then from the waters, the flood; in the middle of that the two gods have taken their rest, in the mid-space.