Starting from the back edge of a beach, trace a thin, winding path in the sand out to the sea. Your task is to get all of the water from a big bucket to follow that path out to sea. If you pour too quickly, the water spills over the edges of your path both damaging the path and cutting its own different path. If you pour slowly and carefully at first, the water both follows and deepens your path. The more water flows through your path, the more water the path can handle without spilling.
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