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Update README_EN.md

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`@@ -211,6 +211,30 @@ impl Solution {`
`211`	`211`	`}`
`212`	`212`	```
`213`	`213`
	`214`	`+#### JavaScript`
	`215`	`+`
	`216`	+```js
	`217`	`+/**`
	`218`	`+ * @param {string} s`
	`219`	`+ * @param {string[]} dictionary`
	`220`	`+ * @return {number}`
	`221`	`+ */`
	`222`	`+var minExtraChar = function (s, dictionary) {`
	`223`	`+ const ss = new Set(dictionary);`
	`224`	`+ const n = s.length;`
	`225`	`+ const f = Array(n + 1).fill(0);`
	`226`	`+ for (let i = 1; i <= n; ++i) {`
	`227`	`+ f[i] = f[i - 1] + 1;`
	`228`	`+ for (let j = 0; j < i; ++j) {`
	`229`	`+ if (ss.has(s.slice(j, i))) {`
	`230`	`+ f[i] = Math.min(f[i], f[j]);`
	`231`	`+ }`
	`232`	`+ }`
	`233`	`+ }`
	`234`	`+ return f[n];`
	`235`	`+};`
	`236`	+```
	`237`	`+`
`214`	`238`	`<!-- tabs:end -->`
`215`	`239`
`216`	`240`	`<!-- solution:end -->`

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