虵

蛇 = 它 + 虫 : Sherlock Holmes (sh) is investigating the death of a mosquito (虫) in the elevator's kitchen (e2). He took a blood sample from the mosquito and analyzes it with his computer (它). It turns out that the mosquito stung the venomous snake (蛇) which is sleeping across the hall, and the venom killed the mosquito.

也 = ㇆ + 丨 + 乚 : Mnemonic symbol: the excavator (as in a person with this job), because a plow and a shovel are both tools for moving earth, and a dinosaur bone is what excavators are digging for.

Maud Younger (y) is helping an excavator (也) in the elevator (e3). Together they are excavating a dinosaur bone (丨): Maud turns the earth with a plow (㇆), while the excavator moves the earth with a shovel (乚).

虫 = 中 + 厶 : Chantal Chicken and a mosquito are taking part in a dart contest just inside the engine's kitchen. The dart board is hanging in the middle of the entrance, and Chantal and the mosquito are standing to the sides. Over each of them a large fake nose is hovering: the loser will be covered in grey goose as punishment.