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Extracting things from any engine depends on lots of things. Contextual links most importantly need good emails and Private proxies. Contextual links are the hardest to make .
It's simple...Have you scrapebox?Go to the SER project manager-->select the contextual-->copy the foot print-->Use in scrapeboxI hope this links are helpful you https://www.inetsolutions.org/optimal-gsa-ser-configuration-updated-regularly/@inet_solutions http://shaunmarrs.com/the-ultimate-guide-to-gsa-search-engine-ranker/@shaun