[Newbies] Ordered Set?

itsme213 itsme213 at hotmail.com
Sun Nov 4 03:26:55 UTC 2007

I have ordered collections of things without duplicates and with an index 
1...N for each, ideally with operations like

  move: anExistingElement to: anExistingPosition

What should I use? I could not find an OderedSet? 

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