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![Gravity Wells / xkcd - A webcomic of romance, sarcasm, math, and language - By Randall Munroe](https://cdn-ak-scissors.b.st-hatena.com/image/square/e4994b827883bc0921213b6ede0a7ce3c3909065/height=288;version=1;width=512/https%3A%2F%2Fimgs.xkcd.com%2Fcomics%2Fgravity_wells.png)