new_contents: f = open("io/data/file1", "rb")
  print(f.seek(6))
  print(f.read(5))
  
  print(f.seek(0, 1))
  print(f.read(4))
  
  print(f.seek(-6, 2))
  print(f.read(20))
  
  print(f.seek(0, 0))
  print(f.read(5))
  
subject: Add test for file.seek().