复式

复 = 𠂉 + 日 + 夂 : Mnemonic symbol: a photocopier.

Frieda Fox (fu) and the sun (日) have to wear high heels (夂) in the space station's bathroom (Ø4). The high heels are locked, and they only have one key (𠂉). They know that the key is very fragile and can only be used once, so they use a photocopier (复) to create more keys so that both of them can be freed.

復 = 复 + 彳 : Mnemonic symbol: a shrine of rejuvenation.

Frieda Fox (fu) only has an old photocopy (复) of her favorite black sneaker (彳). She restores (復) her sneakers to the original state by putting the old photocopy into the shrine of rejuvenation (復) in the space station's bathroom (Ø4).

覆 = 復 + 覀 : Frieda Fox (fu) wants to use the shrine of rejuvenation (復) in the space station's bathroom (Ø4), but someone has been using it for one hundred years already. First, Frieda uses knuckle dusters (覀) to knock the person over the head, but as he doesn't wake up Frieda looses her patience completely and just overthrows (覆) the whole shrine, throwing out the person.

式 = 工 + 弋 : I'll use a specific style as mnemonic symbol: 哥特式, gothic.

Sherlock Holmes and the goth are celebrating a Viking festival in the space station's bathroom. They don't have trunks to throw around, so they use a steel beam. They also celebrate by practising archery. In zero gravity it is easy for them to set one world record after the next.