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Add ch 13 second challenge practice file and solution

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ch13-interact-with-pdf-files
- 7-challenge-unscramble-a-pdf.py
- practice_files
  - scrambled.pdf

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	`1`	`+# 13.7 - Challenge: Unscramble a PDF`
	`2`	`+# Solution to challenge`
	`3`	`+`
	`4`	`+frompathlibimportPath`
	`5`	`+`
	`6`	`+fromPyPDF2importPdfFileReader,PdfFileWriter`
	`7`	`+`
	`8`	`+`
	`9`	`+defget_page_text(page):`
	`10`	`+returnpage.extractText()`
	`11`	`+`
	`12`	`+`
	`13`	`+pdf_path=Path.home()/"github/realpython/python-basics-exercises/" \`
	`14`	`+"ch13-interact-with-pdf-files/practice_files/scrambled.pdf"`
	`15`	`+`
	`16`	`+pdf_reader=PdfFileReader(str(pdf_path))`
	`17`	`+pdf_writer=PdfFileWriter()`
	`18`	`+`
	`19`	`+pages=list(pdf_reader.pages)`
	`20`	`+pages.sort(key=get_page_text)`
	`21`	`+`
	`22`	`+forpageinpages:`
	`23`	`+rotation_degrees=page["/Rotate"]`
	`24`	`+ifrotation_degrees<0:`
	`25`	`+page.rotateClockwise(-rotation_degrees)`
	`26`	`+elifrotation_degrees>0:`
	`27`	`+page.rotateCounterClockwise(rotation_degrees)`
	`28`	`+pdf_writer.addPage(page)`
	`29`	`+`
	`30`	`+output_path=Path.home()/"unscrambled.pdf"`
	`31`	`+withoutput_path.open(mode="wb")asoutput_file:`
	`32`	`+pdf_writer.write(output_file)`

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