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* CBOT May corn fell 4 cents to $3.76 per bushel, losing more than 1 percent for a second straight session.
* Investors continue to watch for news on US-China trade talks on hopes that a deal could include a large grain purchase by China.
* US President Donald Trump said on Monday he was optimistic that a final trade deal could be reached with China and that he would hold a summit to sign any pact, but cautioned an agreement may still not happen.