[relationship] (2 [relationship links])
Isabella Burk [is]
[[a sister] of Frederic Lester Burk, Founder, San Francisco State U.].
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[indeed,]
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Erastus Burk
(1 [relationship link])
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Mathilda Turner
(1 [relationship link])
[are] [at the same time]
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[[the parents] of Frederic Lester Burk, Founder, San Francisco State U.]
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[[the parents] of Isabella Burk]