Your 400 to 600 Article will be published on a high PR site like Wikihow etc.
We will grab 10 relevant articles that will be 90% spunned to pass copyscape. We will distribute the articles in 10 different high PR article sites like doc sharing etc. These articles will be linking to your level one article for added high quality link boost.
We will manually share the level two articles in top 250 Social Bookmarking sites.
We will search relevant blogs that have dofollow links and place 1,000 blog comments that will link back to your level 3 social bookmarks..