function woocommerce_template_loop_product_thumbnail(){
echo '
<div class="col-2 padding-r-10">
<a href="<?php the_permalink(); ?>"><?php the_post_thumbnail(); ?></a>
</div>
';
}
echo '
<div class="col-2 padding-r-10">
<a href="'.the_permalink().'">'.the_post_thumbnail().'</a>
</div>
';
echo '<div class="col-2 padding-r-10">
<a href="';
echo the_permalink();
echo ">";
echo the_post_thumbnail();
echo '</a></div>';
$text = '<div class="col-2 padding-r-10"><a href="';
$text .= the_permalink();
$text .= ">";
$text .= the_post_thumbnail();
$text .= '</a></div>';
echo $text;