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           <h1>Which is mighty great, but it also caused engine clogging, and the emissions vary on the mileage of the vehicle</h1>
           <h1>To quote the paper "The emissions vary depending on the condition of the vehicle. The differences may increase with the mileage, the age of the engine</h1>
           <h1>technology and the degree of engine clogging"</h1>
-          <h1>If you are interested, pdf is here: https://shorturl.at/nxI89</h1> 
+          <h1>If you are interested, pdf is here: https://trans-motauto.com/sbornik/2016/1/26.VEGETABLE%20OILS%20AS%20ALTERNATIVE%20FUEL%20FOR%20NEW%20GENERATION%20OF%20DIESEL%20ENGINES.%20A%20REVIEW.pdf</h1> 
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