Remove Duplicate content because of "showcomments=" links in Blogger

Blogger makes a link for every comment on your blog that is for a post like :
may get urls as :

this is a major problem for famous massively commented posts and blogs,
Here is the way you can solve it using the rel="canonical" attribute

1- Log in to your blogger Dashboard.
2- Choose Layout ( edit HTML template) and Download the template as backup.
3- Find :


4- Put before it the following code :
<!-- block duplicate content START -->
<b:if cond='data:blog.pageType == "item"'>
<link expr:href='data:blog.url' rel='canonical'/>
<!-- block duplicate content END -->

5- Save your template.
Google uses re='canonical' hack in it blog too.

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