Hi, We have redesigned a website and it as more than 4 Million pages created dynamically. After launching the website we got some good traffic, but now nothing is coming from search engines. All our SERP Disappeared. We have done 301 redirect method. But the problem of our website is displaying the same content for more than 70000 pages where it matches the specific keyword. Whether due to duplicate content my SERP disappeared. Example: www.example.com/from-a-to-b www.example.com/from-b-to-a www.example.com/from-a-to-c www.example.com/from-a-to-alpha ...... Wherever they matches a it will display the content but it exists more than 7000 pages Kindly advice how to add canonical tag for this type of urls.