I have been doing this manually where I have four (1 column) lists with some overlapping values and want to assign an attribute to every UNIQUE value depending on whether or not it exists in one of the lists. The code runs and is pretty accurate for first run, but I can't see what I'm missing to make 100% accurate. One problem is, it is leaving out the very first value it tests and doesn't add it when i know it should. Second, it is leaving out about 30 out of the 800 unique values all together. Anyone have a clue!?

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