The LET construct allows the programmer to declare local variables for temporary use and execute multiple forms within the scope of the variable bindings.
(LET ( < variables> ) < statement-1> ... < statement-n> )
The < variables> are initially bound to NIL when the LET is entered; their values may be changed using SETQ.
Variables may be initialized to values other than NIL by specifying a pair, (< var> < init-form> ), in the list of variables.
The value of the LET is the value of < statement-n> , which could be just a variable name.
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