<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_unaligned_lines(self):
 """get the lines that are not aligned"""

    sys.stderr.write("error unimplemented get_unaligned_lines\n")
    sys.exit()
    return [self._lines[x-1] for x in self._unaligned]