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The telescope, a partnership of NASA and the European and Canadian space agencies, homed in on PMR 1, a planetary nebula nicknamed the Exposed Cranium for being the spitting image of a brain scan. The nebula lies about 5,000 light-years away from Earth in the Vela constellation.，推荐阅读纸飞机官网获取更多信息
Words we called op-words before (.word dot in the front) - minus the operators +, *, … are now called a dot-words. It takes first argument from the left (like op-word before),
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