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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:

{{{1,2),(3,-1),{2,-4)},{{1,2},{4,-5},{6,-8}},{{2,-1},{-2,-3},{-4,6}}}

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

{{1,2},{3,-1},{2,-4}}

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 
last.

Thank you,
Dominic



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