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<?php
//* Do NOT include the opening php tag shown above. Copy the code shown below.

global $wp_registered_sidebars;
   if ( isset( $wp_registered_sidebars['header-right'] ) ) {
       wp_enqueue_script( 'sticky-nav-script', get_stylesheet_directory_uri() . '/js/sticky-nav.js', array('jquery'), '1.0.0' );   
   }