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![My Cat](https://blogs.sas.com/content/sastraining/files/2013/01/MsTrixieLouXmas31.jpg)
Over the holidays I was having a discussion with my cat, Ms. Trixie Lou. A question that often arises during the first programming class is the following: how do I find the variables that are in common to these two or three data sets? As it turns out, Ms. Trixie