十进算术

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).

进 = 井 + 辶 : Joan of Arc fell into a well after she entered the encampment's bathroom, but luckily one of her gladiator sandals got stuck on one toilet, so now she can use the string to climb out of the well.

算 = ⺮ + 目 + 廾 : In anthill's bathroom it's Susan Saint Bernard versus the Eye of Providence. The Eye of Providence figures that it has no chances against Susan Saint Bernard who yields two double-axes, while he has only a bamboo stick. He calculates that his chance of survival is rather low.

术 = 丶 + 木 : Mnemonic symbol from 手术: surgeon

术 = 丶 + 木 : In the space station's bathroom the surgeon wants to tickle Sheldon Shrimp with a petal leaf, but Sheldon thinks it's a trap and he wants to cut him open, so he hides behind a Christmas tree.