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my @solution_2 = $content->findvalues( './h2[4]/preceding-sibling::*' 
+);
unless ( @solution_2 )
{
   @solution_2 = $content->findvalues( '//hr/preceding-sibling::*' );
}

@solution_2 = $content->findvalues( '//hr/preceding-sibling::p[precedi
+ng-sibling::h2[3]]' );