Segmented Ribcages can be used to add more limb slots, but carry a
variety of unusual requirements. In addition to a scaling cost in
Nevercold Brass, they require an unfilled tail slot when applied.
It may be prudent to clean up the partial sum formula using helper
methods in the future, as it currently requires a considerable number of
intermediate terms.
itertools.repeat is now being used to perform exponentiation, rather
than repeating terms directly.