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chapter 4 review

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Original file line number	Diff line number	Diff line change
`@@ -3,12 +3,13 @@`
`3`	`3`	`import Stack from './stack';`
`4`	`4`
`5`	`5`	`enum Action {`
`6`		`- TYPE = 'typing'`
	`6`	`+ TYPE = 'typing',`
	`7`	`+ // Add more actions like DELETE, FORMAT, etc.`
`7`	`8`	`}`
`8`	`9`
`9`	`10`	`interface EditorAction {`
`10`	`11`	`action: Action;`
`11`		`- text: string;`
	`12`	`+ text?: string;// Optional text for typing actions`
`12`	`13`	`}`
`13`	`14`
`14`	`15`	`const stack = new Stack<EditorAction>();`

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