1.2.3 to reduce the cost of labor, because if you use sand bags, waterproof. Labor had just 1-2 people, they can be installed, but if you use the original sack. Need more than 3 people, labour-5 people will get the sack and a height that is required because if people will take the time to prepare a sack for a long time, but if it was the amount of time people spent less, but labor costs are higher, according to.
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