{"html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fkiririmode.hatenablog.jp%2Fentry%2F20080101%2Fp2\" title=\"\u554f\u984c2-66 (2.3.3  Example: Representing Sets) - \u7406\u7cfb\u5b66\u751f\u65e5\u8a18\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","published":"2008-01-01 00:00:01","url":"https://kiririmode.hatenablog.jp/entry/20080101/p2","author_url":"https://blog.hatena.ne.jp/kiririmode/","blog_url":"https://kiririmode.hatenablog.jp/","categories":["SICP"],"height":"190","blog_title":"\u7406\u7cfb\u5b66\u751f\u65e5\u8a18","image_url":null,"author_name":"kiririmode","version":"1.0","provider_url":"https://hatena.blog","type":"rich","title":"\u554f\u984c2-66 (2.3.3  Example: Representing Sets)","width":"100%","provider_name":"Hatena Blog","description":"\u30c7\u30fc\u30bf\u3092\u3069\u3046\u8868\u73fe\u3059\u308b\u304b\u3067\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u6027\u80fd\u306b\u5927\u304d\u306a\u5f71\u97ff\u304c\u3042\u308b\u3088\u3068\u3044\u3046\u304a\u8a71\u304c\u306a\u3055\u308c\u3066\u304d\u305f\u306e\u3060\u3051\u3069\u3001\u6700\u521d\u306f\u30af\u30bd\u7c21\u5358\u3067\u76f4\u611f\u7684\u306a\u8868\u73fe\u306b\u3057\u3066\u5f8c\u304b\u3089\u6027\u80fd\u3092\u4e0a\u3052\u308b\u3088\u3046\u306b\u3059\u308b\u306e\u3082\u4e00\u3064\u306e\u624b\u3060\u3088\u3068\u304a\u3063\u3057\u3083\u3089\u308c\u3066\u304a\u3089\u308c\u308b\u3002\u305f\u3076\u3093\u305d\u306e\u4f8b\u306a\u3093\u3060\u308d\u3046\u3051\u3069\u3001\u554f\u984c2-66\u306f\u9806\u5e8f\u7121\u3057\u30ea\u30b9\u30c8\u3067\u8868\u73fe\u3055\u308c\u305f\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u4e0a\u3067\u306elookup\u30922\u5206\u6728\u3067\u8868\u73fe\u3055\u308c\u305f\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u4e0a\u3067\u306elookup\u306b\u3057\u308d\u3063\u3066\u8ab2\u984c\u3002 \u3053\u3093\u306alookup\u3092\u5b9a\u7fa9\u3057\u3066\u3084\u308c\u3070 (define (lookup given-key set-of-records) (cond ((null? set-of-records) #f) ((= given-key (entry set\u2026"}