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Merge pull request #1404 from paroche/patch-47

Update article.md

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Original file line number	Diff line number	Diff line change
`@@ -131,7 +131,7 @@ class Rabbit extends Animal {`
`131`	`131`	`}`
`132`	`132`	```
`133`	`133`
`134`		`-...But usually we don't want to totally replace a parent method, but rather to build on top of it, tweak or extend its functionality. We do something in our method, but call the parent method before/after it or in the process.`
	`134`	`+...But usually we don't want to totally replace a parent method, but rather to build on top of it to tweak or extend its functionality. We do something in our method, but call the parent method before/after it or in the process.`
`135`	`135`
`136`	`136`	Classes provide `"super"` keyword for that.
`137`	`137`

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