Me personally, I did hapkido for 4 years and taekwondo for 2. What about you?
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TKD (ITF style, not shitty Olympic version) for 11 years, 2nd black belt. Muay Thai for 6 years or so. BJJ for a year or two. All in all, I'd say every style learned can help with other styles, you mix it in the most effective way and I suppose that means you end up with MMA.