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It is a common SEO technique to remove ‘stop words’ from the slug URL that are considered low priority in the search algorithm. Also, it helps trim the maximum URL length by creating a summary of the post title rather than the full text.
This plugin will remove the stop words from the URL from a defined list you can edit in the options.
A list of predefined stop words are included with the plugin and also available <a href="http://kaneandre.ws/wp-content/uploads/stop-words.txt" rel="nofollow ugc">here</a>.

Remove Stop Words

Remove stop words from the slug URL in your permalinks for search engine optimization.

Remove Stop Words vs Nginx Helper