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The equivalent meaning of let
We will here understand the underlying, equivalent form of a let name binding construct
(let ((n<sub>1</sub> e<sub>1</sub>) ... (n<sub>k</sub> e<sub>k</sub>)) body-expr)
(<font color = "#0000ff" >(lambda (n<sub>1</sub> ... n<sub>k</sub>) body-expr)</font> e<sub>1</sub> ... e<sub>k</sub>)
An example of an error in let.

It is now obvious that it is not possible to refer to a name ni from one of the expressions ej