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function register_my_menus() {
register_nav_menus(
array(
'menu-1' => __( 'Menu 1' ),
'menu-2' => __( 'Menu 2' ),
'menu-3' => __( 'Menu 3' ),
'menu-4' => __( 'Menu 4' )
)
);
}
add_action( 'init', 'register_my_menus' );