MathGroup Archive 2012

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Automatically retrieving some elements from a list


I wonder whether someone could help to understand what is behind Mathematica syntax.  Here is an example:



I need to extract some values of it so that the output is



The same thing but the output should be


Can a function be written to accomplish the above outputs automatically?

BTW, is there a command to see all the functions under Control`?

Many thanks


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