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By forwarding - if you mean the domains simply redirect to the main domain, where the main site domain name shows in the address bar, then you'll be fine.
If, however, your main the same site content will wear three different domain names in the address bar, then you could be treated as having mirrors, and you'll see 2 of them dropped by Google at least - though which 2 is up to Google, and may not be the choice you would have made.
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