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Add solution to ch13 section 3 exercise 1

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`1`		`-# 13.2 - Concatenating and Merging PDFs`
	`1`	`+# 13.3 - Concatenating and Merging PDFs`
`2`	`2`	`# Solutions to review exercises`
	`3`	`+`
	`4`	`+# ***********`
	`5`	`+# Exercise 1`
	`6`	`+#`
	`7`	`+# In the Chapter 13 Practice Files directory there are three PDFs called`
	`8`	+# `merge1.pdf`, `merge2.pdf`, and `merge3.pdf`. Using a `PdfFileMerger`
	`9`	+# instance, concatenate the two files `merge1.pdf` and `merge2.pdf`
	`10`	+# using`.append()`.
	`11`	`+# ***********`
	`12`	`+`
	`13`	`+frompathlibimportPath`
	`14`	`+`
	`15`	`+fromPyPDF2importPdfFileMerger`
	`16`	`+`
	`17`	`+`
	`18`	`+BASE_PATH=Path.home()/"github/realpython/python-basics-exercises/" \`
	`19`	`+"ch13-interact-with-pdf-files/practice_files"`
	`20`	`+`
	`21`	`+pdf_paths= [BASE_PATH/"merge1.pdf",BASE_PATH/"merge2.pdf"]`
	`22`	`+pdf_merger=PdfFileMerger()`
	`23`	`+`
	`24`	`+forpathinpdf_paths:`
	`25`	`+pdf_merger.append(str(path))`
	`26`	`+`
	`27`	`+output_path=Path.home()/"concatenated.pdf"`
	`28`	`+withoutput_path.open(mode="wb")asoutput_file:`
	`29`	`+pdf_merger.write(output_file)`

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