| 1 | The heart can be likened to a pump. | |
| 2 | We experimented with diesel engines to drive the pumps. | |
| 3 | Farmers say they have to line up at the pumps early in the morning. | |
| 4 | We' ll try again with a new pump in the morning. | |
| 5 | However, these pumps are disconnected from the system by cutoff valves. |
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