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How to Hide PageSpeed Ninja Admin Menus

function plt_hide_psn_pagespeed_ninja_menus() {
	//Hide "PageSpeed Ninja".
	remove_menu_page('pagespeedninja');
	//Hide "PageSpeed Ninja → General".
	remove_submenu_page('pagespeedninja', 'pagespeedninja');
	//Hide "PageSpeed Ninja → Advanced".
	remove_submenu_page('pagespeedninja', 'pagespeedninja_advanced');
	//Hide "PageSpeed Ninja → Upgrade to Pro".
	remove_submenu_page('pagespeedninja', 'javascript:void(0)');
}

add_action('admin_menu', 'plt_hide_psn_pagespeed_ninja_menus', 11);

Where do I put this code?

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