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Commit9d666e8

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Update README.md
set difference is directional in terms of the set being invoked. I update the explanation text and gave another example for s2-s1 case to show the difference.
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‎README.md‎

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###set difference
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`difference` or`-` will return only the elements that arein one ofthesets.
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`difference` or`-` will return only the elements that areunique tothefirst set (invoked set).
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```python
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>>> s1= {1,2,3}
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>>> s2= {2,3,4}
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>>> s1.difference(s2)# or 's1 - s2'
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{1}
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>>> s2.difference(s1)# or 's2 - s1'
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{4}
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```
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###set symetric_difference

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