These ponderings attempt to let themselves be appropriated by the event. (Beiträge zur Philosophie (Vom Ereignis), Martin Heidegger, 1936–38/1989)
https://zh.wikipedia.org/wiki/%E9%82%8F%E8%BC%AF%E9%96%98
https://en.wikipedia.org/wiki/Logic_gate
http://programmermagazine.github.io/y201412/htm/article1.html
