The morning water drips every morning with very clear water. So look how light and small every drop of water fell from the roof and about a big rock beneath it. In the end, the stone will be hollow or leave marks. When calculated, it is not equivalent to the hardness of a stone that was hollowed only because dihujam with water droplets. But the strength is not on the weight and the sharpness of the water droplets. Its strength is in consistency.
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