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Trading the $TNA and $TZA using the $RUT
TNA/TZA 是以 RUT 联系的，这是他们与UNXY 的区别。
$UVXY vs $SVXY 也可以这么做。
what is different; UVXY and SVXY seem do not look like they are linked together and neither are linked to VIX like TNA/TZA/RUT are。
用一张去年的图示说明：（与今天的有点相似）
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