If you are mirroring the 2 sites that could be the kiss of death for your search traffic. Plus I'm not sure that dashes in domains help with rankings anyway.
Dashes in a domain name also lower the value if you ever plan to sell it. I would only get dashes in a domain IF I absolutely had to have those exact words in the name and the only way to get it was dashes because the dashless version was already taken. Just my 2 cents.
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