Sell As Set or Individually? Domains = SEO.mobi / SEO.travel / SEO.name / SEO.coop

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Wondering if I was to sell my SEO domains, would be be better to sell them as a set or individually?

Domains are: www.SEO.mobi / www.SEO.travel / www.SEO.name / www.SEO.coop

Also any ideas on what the value of the set or individual names would be?