I have about a dozen validation ranges in a worksheet, each one assigned to a different column. In column D (4), I'm using validation to allow users to select a single entry from my validation list. In column J (10), I'm using the code below to allow users to select multiple items from my validation list. I also want to allow users to select multiple items from the validation lists in columns L, M, N and T (12, 13, 14, 20). How do I write the code to allow multiple selections in each of these additional columns?

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