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// change related products before reviews
add_action( 'init', 'move_related_products_before_tabs' );
function move_related_products_before_tabs( ) {
    remove_action( 'woocommerce_after_single_product_summary', 'woocommerce_output_related_products', 20 );
    add_action( 'woocommerce_after_single_product_summary', 'woocommerce_output_related_products', 5 );
}