GRAINS-Corn, soy snap back after fund sell-off

* Rebound after month-end fund liquidation * Better corn plantings in west, slow in east * Light deliveries on May lend support * Coming up: USDA's planting progress report Monday (Adds analysts' planting progress forecast) By Sam Nelson CHICAGO, April 29 (Reuters) - U.S. corn futures rose by 4 percent on Friday for the best gains in a month as funds came charging back one day after a

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