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14. The first (1) index of (#List#)
（1）Description: Obtain the location of the data’s first occurrence in the current item (the number of the item)
（2）Type: Information block (variable-type)
（3）Example: Read the index value
Create a list of {5, 1, 2, 1, 7}, and set the index number for the first “1” to “2”.
You can check the result using the FPV window:
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