(setq animals '(giraffe antelope tiger lion))
(giraffe antelope tiger lion)

animals
(giraffe antelope tiger lion)

(setcar animals 'hippopotams)
hippopotams

animals
(hippopotams antelope tiger lion)


(setq tools '(knife eraser pencil compass))
(knife eraser pencil compass)

tools
(knife eraser pencil compass)

setcar tools 'stabler
stabler

tools
(knife eraser pencil compass)