DEFVAR/DEFPPARAMETER just globally declaim that symbol to name a special (= dynamic) variable
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global vs local variables DEFVAR/DEFPARAMETER make global bindings, everything else local
DEFVAR/DEFPPARAMETER just globally declaim that symbol to name a special (= dynamic) variable
other bindings of same name create a local binding that shadows the global binding
any binding created by LET is local, including dynamic binding
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