Should I duplicate keywords in a URL?
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I have a niche where my domain is a part of many long tails and I use different articles to complete the long tail sequence. For example:
Trying to rank "how to make a pizza" ( stupid example hehe )
It´s ranking very well and google can interprete the long tail sequence perfectly
So I would really use only "diagnosis", you will rank good aswell and will look more natural

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Good Morning!
I have been in a similar situation and I found two different videos which helped me out in my decision making process.
This is Matt Cutts on keywords in domain names https://www.youtube.com/watch?v=rAWFv43qubI
This is Matt Cutts on keywords in URL paths https://www.youtube.com/watch?v=971qGsTPs8M
What I ended up doing was making a short list of "static" pages of content that wasn't going to change much. Think of these as my services.
So for example
or
Then from there in our blog section, I started making the more specific, long tail keyword URLS.
In the long run, I don't believe it will negatively impact you repeating keywords. Although I may be wrong. My personal thoughts are that Google is getting closer and closer to searching things like a human would. So I try and view my URL path like a filing system. If I can understand it, and it makes sense to Google, then it's going to end up safe. The last thing you want to do is make a system that is overly redundant and/or spammy, although again i'm not entirely sure if this would qualify as a spam URL path.
Hope this helps!