As far as I can tell, Yahoo has not set a limit on how many ad units you can put on a page.
But the problem I have seen - is that the same ads are served over and over again in separate units (the same ads shown in Unit 1 are also show in Unit 2).
So what's the point of putting more than 2 YPN ad units on a page? One at the top, one at the bottom of a page.
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