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if (! function_exists('slug_scripts_masonry') ) :
if ( ! is_admin() ) :
function slug_scripts_masonry() {
    wp_enqueue_script('masonry');
    wp_enqueue_style('masonry', get_template_directory_uri().'/css/');
}
add_action( 'wp_enqueue_scripts', 'slug_scripts_masonry' );
endif; //! is_admin()
endif; //! slug_scripts_masonry exists