newt0311

    >>> def cons(a, b):
    ...  def lm(f):
    ...   return f(a, b)
    ...  return lm
    ... 
    >>> def car(cns):
    ...  return cns(lambda a, b: a)
    ... 
    >>> def cdr(cns):
    ...  return cns(lambda a, b: b)
    ... 
    >>> x = cons(1, 2)
    >>> car(x)
    1
    >>> cdr(x)
    2