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use absolute internal links, safer in general. do not stress more than naturally needed. GET THEIR LOCAL SEO GOING. think of users, if I am copying that relative link, guess what, as a user, i have to actually DO the part that crawlers take care of in a nanosecond via code... and that is just not so cool in today's ADHD user world. make it easier to get links with every available ounce of opportunity, and this is just a tiny one. what do you mean getting no links at all, that sounds like you are in a deep black hole!