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string method 2. String.prototype.concat(index) 3. String.prototype.split(string | regular Expression, number) 4. String.prototype.substring(start, end) 5. String.prototype.toLowerCase() 6. String.prototype.toUpperCase()

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string method 2. String.prototype.concat(index) 3. String.prototype.split(string | regular Expression, number) 4. String.prototype.substring(start, end) 5. String.prototype.toLowerCase() 6. String.prototype.toUpperCase()

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