Hello.
Background: I have 3 lists. List 1 is a column of unique identifiers. List 2 is a column of unique identifiers. List three is supposed to contain as many rows as the number of rows in List 1 * the number of rows in List 2. Each row in List three has as its unique identifier a value from List 1 concatenated with a value from List 2.
What my problem is: I want to determine, when looking at each row in list 1, if there is an corresponding entry in list 3 for every row in list 2.
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