def make_counter(start=0, step=1):
    def counter():
        return (start+step, make_counter(start=start+step, step=step))
    return counter

twos = make_counter(start=10, step=2)
curr, twos = twos()
print(curr)
curr, twos = twos()
print(curr)
curr, twos = twos()
print(curr)
curr, twos = twos()
print(curr)
curr, twos = twos()
print(curr)
curr, twos = twos()
print(curr)