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Update the cover for Weighted Random algorithm.

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Original file line number	Diff line number	Diff line change
`@@ -59,7 +59,7 @@ const weightedItems = [`
`59`	`59`	`// And now just pick the random item from weightedItems array.`
`60`	`60`	```
`61`	`61`
`62`		-However, as you may see, this approach may require a lot of memory, in case ifthe objects are heavy, andincaseifwe have a lot of themtorepeat in`weightedItems` list.
	`62`	+However, as you may see, this approach may require a lot of memory, in case ifwe have a lot of items to repeatin`weightedItems` list. Think of it asifyou would need to repeat a string like`"some-random-string"` (`18` bytes) a ten million times. You will needtoallocate around`180Mb` of additional memory space just for this array.
`63`	`63`
`64`	`64`	`Themore efficient approach would be to:`
`65`	`65`

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