Order of element in datasetcollection "List"

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Order of element in datasetcollection "List"

Hi all,
I've created a tool which takes a collection List as input.
This tool iterate on this collection with a "for" loop. I'd like to
know the order of my datasets in this collection for the next
treatment in my tools.

For example, when I take dataset number 1 and number 2 and number 3 to
create my collection. When I iterate on it : what is the first
element? the number 1 or the number 3.
I ask it because I've seen that when a tool works on a dataset
collection, the first job  in the history (number of dataset in
history is the lowest) ran on dataset number3 and not on dataset
number 1 as I expected !

Thanks in advance.

Julie Chevalier
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