How to get unique variant option2 values

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Tourist
15 0 2

I'm trying to create a section inside the product page where the user chooses a color of a shirt (as well as the size)

I learned that to get separate values for variant options, I should loop through the variants and get variant.option1 for the first option and variant.option2 for the second option.

However, it's rendering each option multiple times since there's a combination (small + red, large + red, hence renders red twice, for example)

How can I render each color once? uniquely? 

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