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    <component>
      <role>org.codehaus.plexus.component.composition.autowire.One</role>
      <implementation>org.codehaus.plexus.component.composition.autowire.DefaultOne</implementation>
    </component>
    <component>
      <role>org.codehaus.plexus.component.composition.autowire.Two</role>
      <implementation>org.codehaus.plexus.component.composition.autowire.DefaultTwo</implementation>
    </component>
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</plexus>