Your honour, I contend that in order that the foundational relation R stand between A and B, there must be a further relation R’ relation R to A.

I do—I do—declare, is there any explanation in the explanandum if it is a single term? No? Im a simple country lawyer, but I can see the term stands for a rich, theory-laden explanation. So the explanandum is now an explanans for a multitude of explananda for its constituent parts