Hyphens are actually an optimization technique for search engines. Any sites containing more than two hyphens are considered spam and are penalized by google, but if you have a site like abc-xyz.com, the search engines will read it as abc xyz. However if it's just abcxyz.com it's read as abcxyz.
But don't worry about the domain name so much with the hyphen. Just get the keywords in your domain name that you want, just don't overdo it
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