Question: Get the "union" of a list of "intervals"

Hello,

 

Assume we have the following "intervals" (I am not sure what is its formal name in Maple)

 

C :=[0,1/11],[1/11,1/9],[1/9, 1/7],[1/3,1/2],[1/2,1]

 

How can we get the "union" of these intervals? That is to say, obtain  [0,1/7],[1/3,1] 

 

Many thanks in advance for your comments and suggestions.

 

 

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