Guided Practice 4.4

Which of the following are sensible data definitions, according to Lesson 4.4? Why or why not? Write a template for those that are sensible.

A Foo is one of
-- empty
-- (list Number Foo)

{how is this different from a a ListOfNumber}?

================

A Blaster is one of
-- empty
-- (cons Nat (cons Nat Blaster))

================

A Gargle is one of
-- (list Nat)
-- (cons Nat (cons Nat Gargle))

================

A GargleBlaster is one of
-- a Gargle
-- a Blaster

[SOLUTION]