We set some values

(setq x '((b) a c))

(setq y (copy-list x))

x => ((b) a c)

y => ((b) a c)

(setf (second x) 'k) => k

x => ((b) k c)

y => ((b) a c)

(setf (car (first y)) 'm) => m

x => ((m) k c)

y => ((m) a c)

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