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Reuters reports that the move is impacting shipments in one of the world's top exporters of grain.
"We are going to make surprise halts as much as we consider it necessary," said Juan Carlos Peralta, a spokesman for the URGARA union, which represents inspectors who check the quality of grains before they are loaded onto ships.
"It is a strike in one of the richest sectors in Argentina. We have exhausted all avenues of dialogue."
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