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The nuclear non-proliferation treaty went into effect begging in 1970 for a period of 25 years in 1995, an international conference

Adeclined to review it
Brenewed it for another 25 years
Crenewed it permanently
DRenew it, but increased the number of permitted nuclear powers

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The nuclear non-proliferation treaty went into effect beginning in 1970 for a period of 25 years until an international conference "A. declined to review it" since they thought it wasn't working. 

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