憑空

凭 = 任 + 几 : Pocahontas (pi) is the chef of the engine's kitchen ((e)ng2) and she has become very popular for her excellent food, but she relies solely on (凭) her cooking assignments (任) which she keeps on a small table (几).

空 = 工 + 穴 : Mnemonic symbol: an air conditioner

空 = 工 + 穴 : In front of the engine, Karl Koala found some very special cave paintings. Using steel beams he constructs a protective cover. He also installs air conditioning to make the best environment possible to preserve the cave paintings.