Assertion: african elephant | /r/HasProperty | reintroduced in 1980
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Source sentences:
text: They are known to have become nationally extinct in Burundi in the 1970s, in The Gambia in 1913, in Mauritania in the 1980s, and in Swaziland in 1920, where they were reintroduced in the 1980s and 1990s.