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Merge pull requestwilfredinni#59 from samithamphk/master

Update README.md

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Original file line number	Diff line number	Diff line change
`@@ -1710,13 +1710,15 @@ KeyError: 3`
`1710`	`1710`
`1711`	`1711`	`###set difference`
`1712`	`1712`
`1713`		-`difference` or`-` will return only the elements that arein one ofthesets.
	`1713`	+`difference` or`-` will return only the elements that areunique tothefirst set (invoked set).
`1714`	`1714`
`1715`	`1715`	```python
`1716`	`1716`	`>>> s1= {1,2,3}`
`1717`	`1717`	`>>> s2= {2,3,4}`
`1718`	`1718`	`>>> s1.difference(s2)# or 's1 - s2'`
`1719`	`1719`	`{1}`
	`1720`	`+>>> s2.difference(s1)# or 's2 - s1'`
	`1721`	`+{4}`
`1720`	`1722`	```
`1721`	`1723`
`1722`	`1724`	`###set symetric_difference`
`@@ -1998,7 +2000,7 @@ itertools.filterfalse(predicate, iterable)`
`1998`	`2000`	`Example:`
`1999`	`2001`
`2000`	`2002`	```python
`2001`		`->>> data= [1,2,3,4,5,6,7,8,9,10]`
	`2003`	`+>>> data= [1,2,3,4,5,6,7,8,9,10,1]`
`2002`	`2004`	`>>> result= itertools.filterfalse(lambdax: x<5, data)`
`2003`	`2005`	`>>>for eachin result:`
`2004`	`2006`	`>>>print(each)`

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