Support removing previously synced contacts

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http://androidforums.com – all my personal contacts are synced to my gmail account, which honestly consist of not more than a hundred people. yesterday, i added my corporate email to my phone and forgot to remind myself not to tick on the "exchange sync contacts" - i was actually only going for the mails. and sooo, i then noticed just now, that all contacts associated on my corporate mail exchange is now synced on my phone. what's the simplest way to remove the previously added contacts? and retain only my gmail contacts. ive already disabled my exchange synced contacts option. (General)