@OldManEd
1 - The value 100 in the return command is to specify how many lines do you want of values of the specified field. As I have no idea how many you have, it is better to specify a high value to make sure all the values you want are included. So you're correct, default is to 1 and this needs to be adjusted to the size of everything in the column
2 - Return command returns an OR format automatically indeed. You don't need, actually you mustn't use the formata you mentioned there. The format I gave you is exactly what the syntax and logic requires. Test for yourself the subsearch I gave you and see what it is passing to the primary search.
Please @OldManEd if you think this answer is correct, upvote it and accept it
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