human
Solve the following python programming problem given the following code:
# (a|c) & (b|d)
    @process_slot("a", "b", "c", "d") 
    @run_if_any("a", "c")
    @and_any("b", "d") 
    def run_step(self, run_number, step_size, howlong):
        with self.context as ctx:
            pass # do something
Given the above code, generate some markdown instructions for it.
assistant
#Here is the Python program you requested.

The @and_any extension decorator
It makes possible nested conditions (2 levels) in the form :
(a | b | ...) &amp; (x | y | ...) &amp; ...