The lengths of the two wires are 65 meters and 91 meters respectively, and when they are measured with a wooden ruler, they are both exactly measured and there is nothing left. How many meters is this wooden ruler at most?
两根铁丝分别长65米和91米，用一根木尺分别去丈量它们，都恰好量完而无剩余．这根木尺最多有多少米长．
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