共价键

共 = 井 + 八 : A giant eight-ball is blocking the well in the engine's bathroom. Joining forces together with the communist, Gitta Giraffe and he are able to push the eight-ball off and make the well available to the public again.

共 = 井 + 八 : Mnemonic symbol: the communist.

价 = 亻 + 介 : Joan of Arc (ji) and Rosa Luxemburg (亻) are plotting their escape from the ashram in the bathroom (a4). They plan to use the ashram's rocket (介), but unfortunately, the price (价) for rockets is sky-high.

键 = 建 + 钅 : Blob the Builder (建) built a fort out of keyboard keys (键) to defend against Joan of Arc (ji) who attacks him and his fort with a golden harpoon (钅) in the anthill's bathroom (an4).