text: # Write a function or lambda using the implementation of fold below that will
  # return the product of the elements of a list.
  def or_else(lhs, rhs):
  	if lhs != None:
  		return lhs
  	else:
  		return rhs
  
  def fold(function, arguments, initializer, accumulator = None):
  	if len(arguments) == 0:
  		return accumulator
  	else:
  		return fold(
  				function,
  				arguments[1:],
  				initializer,
  				function(
  						or_else(accumulator, initializer),
  						arguments[0]))
  
  