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<?php
add_filter( 'generate_default_color_palettes', 'tu_custom_color_palettes' );
function tu_custom_color_palettes( $palettes ) {
	$palettes = array(
		'#111111',
		'#222222',
		'#333333',
		'#444444',
		'#555555',
		'#666666',
		'#777777',
		'#888888',
	);
	
	return $palettes;
}