Hi hanusoftware your question is good first of all please stop pursuing
PR its not going to last longer as today all the
seo's have stopped chasing it instead work for the SERP's.
I will tell you the way to increase
PR but try to stop chasing it:
1) Build Links
2) Linking from Authority Sites same niche
3) Forum Signatures
4) Writing Articles and submitting to article directory with a link on the article pointing your site
5) Blogging on the niche as your site with a link back.
6) Commenting on Blogs with some thing creative.
7) Social Bookmarking
Links from the sites with high SERP's and Authority will gain you more if compared with the sites with less authority.
Hope this solves your issue.
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