Let's say I have a website and I want to rank for a bunch of long tail keywords for every industry. For example: "long tail keyword plumber" "long tail keyword lawyer" "long tail keyword realtor" etc. And I wanted to do this for 50+ different industries. I want to create different pages on my website for this - each one with the URL and title of the page being "long tail keyword + industry." Can I use the same article for each page and just change the keywords on the page? For example "blah blah blah plumber." and just change it to "lawyer" for the lawyer page, etc. Or does each and every page need to be totally unique? If so, does it need to pass copyscape? Or can I just change things up a little?