Anyone that use Blogspot with google adsense...

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I currently have Google Adsense on my Blogspot website. And I looked all over the Terms of Service to see if this was allowed or not but couldn't find it anywhere. I am wondering if you are allowed to advertise with any other groups other than just adsense. I have seen some like bidvertiser, adster, ad toll, adbrite, etc. I just want to know if you are allowed to add other advertisements to the site or if Blogspot doesn't allow it. If anyone knows the answer to this let me know. Thanks.