第9章：…… もう一度、もう一度、もう一度、…… keep-looking (define (pick to lat) (cond [(= to 0) (car lat)] [else (pick (- to 1) (cdr lat))])) (define (keep-looking a to lat) (cond [(number? to) (keep-looking a (pick to lat) lat)] [else (eq? …