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Hi i would to change permalink in my WordPress site for listings as default permalink is ( to (

City is the category with list of multiple cities and services is a list of multiple services offered

if i search for some service in a particular city for eg. seo training in Bangalore, then i want my site to appear in any search engine as training

Please guide me how to achieve this in my theme as if i do any changes in default word-press permalink section under settings, but am surprised to see that even after i do necessary changes this is not getting updated

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