Topic: Strange behavior with the "AND" statement

[Giuseppe Beatrice]

I noticed a strange behavior with the "AND" statement.
The construction (cond ((and (setq lst1 (cdr lst)) (= (nth 1 lst1) 3)) ...)
causes an error if lst1 = nil
I knew that the "and" statement does not perform subsequent evaluations of the first nil value it finds.
Is there anything wrong with the construction of the command?

[Giuseppe Beatrice]

Please forgive me.
I had made a mistake writing the statement as (cond (and ...))
The error errs in the absence of the initial double parenthesis after "cond".
Sorry again