...He then enumerates the vice of the slaves: "The divine institution ofmarriage depends for its perpetuity, sacredness, and value, largelyupon the protection given it by the law of the land... 
Booker T. Washington 「The Negro in the South」
...I do not think that the perpetuity ofthe tick can be defended from any economic standpoint...
Florida State Live Stock Association 「Florida: An Ideal Cattle State」
...This isnot perfection, not even perpetuity...
Henry Warren 「Recreations in Astronomy」
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