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by lispm 5691 days ago
Scheme R6RS: LET, LET* , LETREC, LETREC* , ...

I guess you have to learn those. Once you understand what the * means, you can easily see the difference between any construct with and without * .

It's basically the question whether bindings are done in parallel or sequentially nested. That topic should be described in a beginners book when learning some Lisp dialect.