How can I better think about this balancer? this is a 3->1 balancer, and I would like to be able to tell for myself whether we would classify this as I.B. or O.B.. Often we might like to deplete our resource patch as evenly as possible, so that we can preserve as high a rate of output for as long as possible, and so it makes sense to try to draw from n belts as evenly as we can. We can think about each lane as labeled {A,B,C} as often seen in explanations of balancers. from the right, we see lanes B and C are balanced onto a single lane, BC. From the left , lane A is harder to understand for me. I would try to articulate my understanding, but I don't understand well enough to say. If someone could help me understand lane A's behavior, and maybe also eluciate how to better think about balancers in general, and in particular I.B. vs O.B. I would be grateful.
edit: I should add that the screenshot is an attempt at observing the behavior of the balancer, the left box has 19 items, where the two boxes on the right have 27 and 28. So it would seem maybe this is not input balanced. but maybe we would say it is, and its just not 100% perfect.