Duplicatef index value due to duplicated value in lost

Revit
,
1

Hi there:

How I can fix duplicated index value due to duplicated items in list?

For example:

List:
0 1
1 5
2 1

I’ll have index list as following
0 0
1 1
2 0

Please advice

2

list unique items ?!

Can explain more please.

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