In the Taihang Mountains, in northern Henan, there is a peak with an altitude of more than 800 meters. There is a cave about four or five meters deep on the mountain. On the cave wall, there is a stone that looks like a dragon or a python. Moreover, water seeped out from the head of this dragon python drop by drop from the tip. Moreover, the water seepage time is exactly one drop per second. Moreover, because the color of the stone is somewhat black, the mountain people here named the cave "Heilong Cave" and the mountain called Heilong Mountain.
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