一次生，两次熟

Maud Younger (y) forgot her keys to the space station (Ø1), all she brought outside was her flute (一). She has no choice but to crash the door with the giant flute.

次 = 冫 + 欠 : Mnemonic symbol: the cube, as in words involving 三次 relate to "cubic equations" or "cube (third power)". The King of Chu (c) pulls a popsicle (冫) out of the cube (次) in the space station's bathroom (Ø4) and leaves an IOU note (欠) on the cube.

生 = 牛 + 一 : Mnemonic symbol: a cradle.

Sherlock Holmes (sh) comforts a crying baby bull (牛) in a cradle (生) in front of the engine ((e)ng1) and plays him a tune on a flute (一).

两 = 一 + 从 + 冂 : Li Qingzhao is on a treasure hunt in the anglepod, following a secret map she found. Finally she found a treasure chest guarded by a rubber chicken which she has to overcome. Luckily, the map mentions a tune that Li Qingzhao plays on her flute, and thus bewitching the rubber chicken. The rubber chicken releases the treasure chest, which is full of taels of gold.

熟 = 享 + 丸 + 灬 : Sheldon Shrimp (shu) concocts an elixir against his stomach ache in the space station's kitchen (Ø2). On a small grill (灬) He put a drink (享) in which he dissolves a whole bag of painkillers (丸). When the pills are fully dissolved, his elixir is done (熟).

熟 = 孰 + 灬 : The riddler captured Sheldon Shrimp (shu) in the space station's kitchen (Ø2) and threatens to put him on a grill (灬) and cook him until he is ripe (熟) if he fails to win a game of "who am I" (孰).