Price's law
https://source.unsplash.com/featured/?Price's-law#.png
/suto3/google.icon
Price's law
/suto3/Google画像検索.icon
Price's law
/suto3/Google定義検索.icon
Price's law
/suto3/wikipedia.icon
Price's law
/suto3/weblio.icon
Price's law
/suto3/kotobank.icon
Price's law
/suto3/jisho.icon
Price's law