Answer:
By their common characterisitcs
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Bolivia on the north-west and north, Brazil on the east, and Argentina on the south and south-west.
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It is certainly the most efficient system of reproduction.
It doesn't require dating, dinner, movies, courtship, etc.,
and it doesn't even require locating another compatible,
cooperative individual, or even knowing anybody else.
It eliminates all of the preliminaries, and cuts straight to the chase.
Even headaches are irrelevant.
