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source/_gtm.haml

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+/ Google Tag Manager
+%noscript
+  %iframe{:height => "0", :src => "//www.googletagmanager.com/ns.html?id=GTM-MRZ5F7", :style => "display:none;visibility:hidden", :width => "0"}
+:javascript
+  (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':
+  new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],
+  j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src=
+  '//www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);
+  })(window,document,'script','dataLayer','GTM-MRZ5F7');
+/ End Google Tag Manager