In page 45-46, the
orbital-period-transformation function takes a
star argument, but when it’s used in the
orbital-periods functions, there’s no mention of a
star object. How is
orbital-period-transformation the transducer? Or is it the transformation and
orbital-periods is the transducer? Or is transducer and transformation interchangeable? Or does calling
(sequence orbital-period-transformation planets) return a transducer?