I was reading one of Google's case studies on how one publisher raised his income from 10,000 a month to 30,000 a month with some minor changes.
link to Googles case study: https://www.google.com/adsense/static/e ... ilder.html
Of course I was interested and I checked out the site but it has 6 regular ad units placed on almost all articles.
I'm only able to place 3 + other types of units, how can you place 6 ?
edit: 6 ad units on most pages, not 5. And if 6 isn't allowed for everyone else why is this a case study?

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