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so difficult very difficult so easy very easy
difficult much difficult very more difficult much more difficult
-∞＜χ2＜+∞ 0≤χ2≤+∞ χ2≤1 -∞≤χ2≤0 χ2≥1
difficult much difficult very more difficult much more difficult
difficult very difficult more difficult as difficult
χ12 =χ22 χ12 ＞χ22 χ12 ＜χ22 χ12 比χ22准确 χ22 比χ12准确
difficult something something difficult anything difficult nothing difficult
difficult difficulty relaxing not difficult
They are new movements They are good for memory They can slow down their heart rate. They are good for joints
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difficult difficulty relating not difficult
-∞<χ2<+∞ -∞<χ2<0 0χ2<+∞ -1<χ2<1 χ2≤1
very difficult too difficult difficult enough so difficult
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