special variable creation 2
CL-USER(4): *alpha* ;; (defvar *alpha*)
Error: Attempt to take the value of the unbound variable '*ALPHA*'.
[condition type: UNBOUND-VARIABLE]
CL-USER(6): *beta* ;; (defvar *beta* (* 2 3))
CL-USER(7): *gamma* ;; (defparameter *gamma* (* 2 7))