Maybe I am incorrect but my understanding was " Wave X is any correction pattern, except a triangle or a double or triple pattern." Doesn't this make your correction a 3-5-3?
ElliottWavePro
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May be we use different sources of the Elliott Wave Theory, but as I know from Robert Prechter' book, wave X (in Double Three or Double Zigzag) could be any correction pattern, including a triangle.