The_Nofollow_tricks

You can concentrate on Page Rank where you need it with the nogollow attribute.First you create blog comments spam.The nofollow attribute can ba added to links that points to pages to which you don't want refer Page Rank.Nofollow attribute to concentrate its reffered Page Rank to flow to only those which wants to promote,
Such Example of code-

Seo tips

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Free-create-back-link
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Tips-4blog-posting
How-to-optimization-your-website-best-secret-of-seo
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Seo-tips_for Blogger
Seo_on_link_building