Well you're looking for something like a "partnership" judging by your Google search. If so you won't find it. At least not yet because they aren't partners. Collaboration is generally less informal than something like a partnership. Serpro and Multicortex aren't partners but the post implicated they do work together on certain projects and Serpro probably contacts Multicortex for certain things to achieve a project they're working on, advice, or solution towards a shared goal etc. Essentially they team up from time to time is what i gather from the initial tweet/post.
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