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The 3-digit numbers ab4‾\overline{ab4}ab4 and 4ab‾\overline{4ab}4ab satisfy the property 400−ab4‾=4ab‾−400400 - \overline{ab4} = \overline{4ab} - 400400−ab4=4ab−400. What is the 2-digit number ab‾\overline{ab}ab?
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