国
=
囗
+
玉
:
Mnemonic symbol: a nation's flag. Let's say the Chinese flag.
In the observatory's kitchen (o2) Gitta Giraffe (gu) is practising her ballet performance. She got a whole crate (囗) full of jade bracelets (玉) and flags (国) and fixed one flag to each jade bracelet. This makes a perfect combination for throwing the ring with the flag waving behind it and catching the ring again after a few pirouettes.
收
=
丩
+
攵
:
In front of the outhouse, Sherlock Holmes is proud to receive a honorary sledge hammer for his fine detective work. Everyone is so afraid of him that they hand him the sledge hammer from far away using a roast fork.
入
=
丿
+
㇏
:
Mnemonic symbol: an enter key like on a computer keyboard.
There is a special area in the space station's bathroom (Ø4) which is filled with bananas (丿), but you have to hit an enter key (入) to enter (入). Rachel Rhinoceros (ru) uses a finger (㇏) to press the button and get access to the bananas.