二十五史

二 = 一 : Mnemonic symbol: a capacitor, because the two strokes remind me of the symbol in electrical drawings. Albert Einstein (Ø) is experimenting with a capacitor (二) in the space station's bathroom (Ø4). He finds that it's uncomfortable to discharge a capacitor using two flutes (一).

十 = 一 + 丨 : Mnemonic symbol: a holy cross. Sherlock Holmes (sh-) is investigating a very strange thing he found in the kitchen of the space station (-2): A big pyramid made of ten (十) crosses (十), which are in turn made out of flutes (一) and dinosaur bones (丨).

五 = 王 + 丨 : Mnemonic symbol: a pentagram.

Martin Luther King (王) helps Willy Walrus (w) to construct a pentagram (五) out of dinosaur bones (丨) inside the space station (Ø3).

五 = 工 + 乛 : Mnemonic symbol: a pentagram.

In the space station (Ø3), Willy Walrus (w) chops up a steel beam (工) with a sickle (乛) into five (五) equal parts. He uses the five parts to assemble a steel pentagram (五).

史 = 口 + 乂 : For a mission in the space station (Ø3) Sherlock Holmes (sh) has to find out the history (史) of a mandarin (口), so with a pair of pliers (乂) he took to the space station he squeezes the mandarin like an orange.