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The let* name binding construct
It is often useful to be able to use previous name bindings in a let construct, which binds several names
 
(let* ((n<sub>1</sub> e<sub>1</sub>)
       ...
       (n<sub>i-1</sub> e<sub>i-1</sub>)
       (n<sub>i</sub> e<sub>i</sub>)
       ...
       (n<sub>k</sub> e<sub>k</sub>))
    body-expr)