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* Chicago Board of Trade December corn settled a penny lower at $3.66-3/4 per bushel. The contract failed to hold gains after breaking above its 100-day moving average.
* Largely favorable US Midwest harvest weather weighed on prices. The harvest pace remains behind normal, but has caught up slightly following rain delays earlier this month.
* Analysts polled by Reuters projected the harvest to be 64 percent complete as of Sunday, up from 49 percent a week earlier. The US Department of Agriculture is due to report harvest progress at 3 p.m. CDT (2000 GMT)