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Add ch13 section 5 exercise 2 solution

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`@@ -27,3 +27,19 @@`
`27`	`27`	`output_path=Path.home()/"top_secret_encrypted.pdf"`
`28`	`28`	`withoutput_path.open(mode="wb")asoutput_file:`
`29`	`29`	`pdf_writer.write(output_file)`
	`30`	`+`
	`31`	`+`
	`32`	`+# ***********`
	`33`	`+# Exercise 2`
	`34`	`+#`
	`35`	+# Open the `top_secret_encrpyted.pdf` file you created in exercise 1,
	`36`	`+# decrypt it, and print the text on the first page of the PDF.`
	`37`	`+# ***********`
	`38`	`+`
	`39`	`+pdf_path=Path.home()/"top_secret_encrypted.pdf"`
	`40`	`+pdf_reader=PdfFileReader(str(pdf_path))`
	`41`	`+`
	`42`	`+pdf_reader.decrypt("Unguessable")`
	`43`	`+`
	`44`	`+first_page=pdf_reader.getPage(0)`
	`45`	`+print(first_page.extractText())`

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