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* Basis offers for truck-delivered meal were largely unchanged.
* Spot basis bids for soymeal delivered by barge to Gulf Coast export terminals were steady to firm as river flooding slowed deliveries.
* Chicago Board of Trade May soymeal futures fell to a new contract low of $300.30 per short ton on Tuesday before rebounding. The contract was up $1.40 at $302.70 per short ton at 10:56 a.m. CDT (1556 GMT).