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Question about Mathematica

Hi.  Can someone help me with the following question:

I have a table of a table of number pairs:


How may I find the minimum second element in each sub-table?  For 
example, the first sub-table is:


I would like to then extract the {2,-4} element from this item.  Then 
the {6,-8} from the second sub-table, then the {-2,-3} element from the 

Thank you,

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