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<!-- app/design/frontend/package/theme/layout/local.xml-->
<layout version="0.1.0">
    <default>
    
    </default>
    
      <catalog_product_view>
          <reference name="root">
              <action method="setTemplate"><template>page/1column.phtml</template></action>
              <!-- layout files
                1column.phtml
                2columns-right.phtml
                2columns-left.phtml
              -->
              </reference>
      </catalog_product_view>
    
</layout>