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Add return examples and catch error examples

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	`1`	`+'use strict';`
	`2`	`+`
	`3`	`+function* genFn() {`
	`4`	`+ yield 10;`
	`5`	`+ yield 20;`
	`6`	`+ yield 30;`
	`7`	`+}`
	`8`	`+`
	`9`	`+try {`
	`10`	`+ const g = genFn();`
	`11`	`+ const val1 = g.next();`
	`12`	`+ const val2 = g.next();`
	`13`	`+ const val3 = g.next();`
	`14`	`+ const val4 = g.throw('Error message');`
	`15`	`+ console.log({ val1, val2, val3, val4 });`
	`16`	`+} catch (err) {`
	`17`	`+ console.error(err);`
	`18`	`+}`
	`19`	`+`
	`20`	`+try {`
	`21`	`+ const g = genFn();`
	`22`	`+ const val1 = g.next();`
	`23`	`+ const val2 = g.throw('Error message 1');`
	`24`	`+ const val3 = g.next();`
	`25`	`+ const val4 = g.throw('Error message 2');`
	`26`	`+ console.log({ val1, val2, val3, val4 });`
	`27`	`+} catch (err) {`
	`28`	`+ console.error(err);`
	`29`	`+}`

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