You should separate all lists like the keyword list with keyword - comma - space - keyword. This is the standard written list format and is the recommended way to separate keywords.

There's a lot of info online about this.

separate keywords with commas - Google Search

__________________
Latest Blog Post: Google Consultant - Should this Job Title be Allowed? - Matt Inertia's SEO Blog - SEOers.org

"Carpe diem, seize the day boys, make your lives extraordinary" - Dead Poets Society