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<?php
function add_fonts() {
	// Styles Format:  wp_enqueue_style($handle, $src, $deps, $ver, $media);
        wp_register_style('open-sans', 'http://fonts.googleapis.com/css?family=Bree+Serif:400,300,700', array(), false, 'all');
        wp_enqueue_style( 'open-sans');
}
add_action('wp_enqueue_scripts', 'add_fonts', 100);