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IBM InfoSphere Optim Test Data Management Solution Masking Data Using a Column Map Procedure Part 1- This video, which is the first in the series, shows how to use a Lua string function to privatize sensitive data by reversing the characters in a specific column. In particular, the phone numbers in the supplied, sample OPTIM_CUSTOMERS table for U.S.-based customers are masked. Each portion of the phone number is reversed individually (e.g. area code, exchange, last four digits).