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function wc_remove_related_products( $args )
{    if (is_product() && has_term( 'Mühlomat Extra' , 'product_cat') or has_term( 'M100 Extra' , 'product_cat'))
    {        return array();     } 
    return $args;
}
add_filter('woocommerce_related_products_args','wc_remove_related_products', 10);