Hi there. Is it possible to have a rectangular subsystem (which is masked) to have ports on ALL four sides? How can we design that? Can the masked system be circular in shape? (like the round ADD block). Can we design polygons, with each side capable of taking input or giving output? Is that possible at least for electrical subsystems (where there is no direction)? Ex: a rectangular box with four electrical ports, one on each side. Thank you.