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<?php
// For https://wordpress.org/plugins/simple-urls/ plugin
// From https://gist.github.com/cliffordp/f5cdb9b5f44628d8082f
// To replace 'go' with 'link' (you can change 'link' below to whatever you want)
add_filter( 'simple_urls_slug', 'my_own_slug_prefix' );
function my_own_slug_prefix() {
  return 'link';
}