When I do keyword research for example I came up with 2 keyword phases, "A4 paper coupons" and "A3 paper coupons". Is it wise to register a domain A3A4papercoupons ? or just A4papercoupons / A3papercoupons are a better option? Using A3A4papercoupons seems being able to target both keywords well. Also, is putting in hyphens good for SEO? Say the best domain for this should be A3-A4-paper-coupons I have heard people saying they don't like hyphens, since you don't often seen them ranking high. But I also heard that hyphens are good for SEO as to make your domain more readable, so G like that. What is your call?