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defineIfSlot('/21821800277/pw/pw_x05_gs', [[160,60]], 'div-gpt-ad-3759129-6', pubads); defineIfSlot('/21821800277/pw/pw_x06_gs', [[160,60]], 'div-gpt-ad-3759129-7', pubads); defineIfSlot('/21821800277/pw/pw_r_ap', [300, 250], 'div-gpt-ad-1563268425067-0', pubads); defineIfSlot('/21821800277/pw/pw_r1_ap', [[300,250]], 'div-gpt-ad-3759129-11', pubads); defineIfSlot('/21821800277/pw/pw_x10_ss', [[160,60]], 'div-gpt-ad-3759129-12', pubads); defineIfSlot('/21821800277/pw/pw_x11_ss', [[160,60]], 'div-gpt-ad-3759129-13', pubads); defineIfSlot('/21821800277/pw/pw_x12_ss', [[160,60]], 'div-gpt-ad-3759129-14', pubads); defineIfSlot('/21821800277/pw/pw_x13_ss', [[160,60]], 'div-gpt-ad-3759129-15', pubads); defineIfSlot('/21821800277/pw/pw_x14_ss', [160, 60], 'div-gpt-ad-1563269243507-0', pubads); defineIfSlot('/21821800277/pw/pw_x15_ss', [[160,60]], 'div-gpt-ad-3759129-17', pubads); const leaderboard = googletag.sizeMapping() .addSize([970, 0], [[970, 90], [728, 90]]) // Larger screen ads 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'div-gpt-ad-5400963-20').defineSizeMapping(headerSize).addService(pubads); // Only apply targeting if values exist const article_og = getOgType(); if ( article_og ) { pubads.setTargeting( "articleTag", article_og ); } const article_type = getMetaContent( "oas:article-type" ); if ( article_type ) { pubads.setTargeting( "articleType", article_type ); } const article_category = getMetaContent( "oas:category" ); if ( article_category ) { pubads.setTargeting( "category", article_category ); } const article_sub = getMetaContent( "oas:sub-category" ); if ( article_sub ) { pubads.setTargeting( "subCategory", article_sub ); } // Add class to body if ads are visible pubads.addEventListener( "impressionViewable", function () { document.body.classList.add("has-ads"); }); pubads.enableSingleRequest(); pubads.collapseEmptyDivs(); // Start! googletag.enableServices(); }); </script>  </head> <body class="archive category category-materials category-161 not-logged-in"> <a class="sr-only" 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