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Fix side effect part 2 list

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Original file line number	Diff line number	Diff line change
`@@ -582,10 +582,11 @@ edit it, and return the clone. This ensures that no other functions that are`
`582`	`582`	`holding onto a reference of the shopping cart will be affected by any changes.`
`583`	`583`
`584`	`584`	`Two caveats to mention to this approach:`
`585`		`-1. There might be cases where you actually want to modify the input object,`
	`585`	`+1. There might be cases where you actually want to modify the input object,`
`586`	`586`	`but when you adopt this programming practice you will find that those case`
`587`	`587`	`are pretty rare. Most things can be refactored to have no side effects!`
`588`		`-2. Cloning big objects can be very expensive in terms of performance. Luckily,`
	`588`	`+`
	`589`	`+ 2. Cloning big objects can be very expensive in terms of performance. Luckily,`
`589`	`590`	`this isn't a big issue in practice because there are`
`590`	`591`	`[https://facebook.github.io/immutable-js/](great libraries) that allow`
`591`	`592`	`this kind of programming approach to be fast and not as memory intensive as`

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