I've installed rt_radiance template with its sample data. While looking at it, I noticed that there is a Roktabs module below content position in the front page, the position of which I believe is "content-bottom-a" position
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But when I look at module manager, there isn't any roktab module published in "content-bottom-a" position, insteadly, I find the Roktabs module I mentioned above is actually published in a position called "tabs". But, I can't find this "tabs" position in the module map, also I can't find any place where this module is loaded by {loadposition tabs}. So I'm wondering how this is working?