URL：https://res.cloudinary.com/zenn/image/fetch/s--xm3nvLku--/c_limit,f_auto,fl_progressive,q_auto,w_1200/https://storage.googleapis.com/zenn-user-upload/deployed-images/596c412beed9b8cd8bd22542.png?sha=a5f4e8c50313071f15535d3ee91d84fc9b626a33
掲載元：https://zenn.dev/yoshia/articles/c0-section30-multidimensional-array-a-b3759246b131
