def qw(s):
  """
  Examples :
    >>> print(qw(“ -correlated-propagation -scalarrepl -lowerinvoke”))
    (-correlated-propagation, -scalarrepl, -lowerinvoke)

  Args:
    s (str):  s is a list of all the possible passes that can be used (the passes shoul dvbe separated by whitespace).

  Returns:
    Returns a tuple of strings where each element is a pass(used for optimization) from s.
  """
  return tuple(s.split())