7ばっかり取り出しますね!
gosh> (car (cdr (car (cdr (cdr (list 1 3 (list 5 7) 9)))))) 7
gosh> (car (car (list (list 7)))) 7
たぶんこのコードが右に突き抜けて表示されるんだけど、無視する。
gosh> (car (cdr (car (cdr (car (cdr (car (cdr (car (cdr (car (cdr (list 1 (list 2 (list 3 (list 4 (list 5 (list 6 7)))))))))))))))))) 7