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mud that is sent by swallows and used to build their nest.
This swallow mud is used by swallows to build their nests.
(historical) De-Kastri, de Castries (a settlement in Khabarovsk Krai, Russia)
I visited De-Kastri, a historical place.
the Devonian period
The Devonian period was a very important time in the history of the Earth.
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