MathGroup Archive 2007

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Passing a list as seperate parameters?

I have a recuring problem in using mathematica, which I'm sure there
must be a simple fix for, but I've looked through the manual and can't
find it.

As an example, I build up the list { {a,b},{c,d} }, and I want to find
the union of it's elements.

At first glance, I want Union. However, Union wants it's input as
Union[{a,b},{c,d}], Union[{{a,b},{c,d}}] doesn't do anything.

In general I get around this by fold, but it seems there should be a
simpler method?

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