核四

核 = 亥 + 木 : Hamlet (h) is unpacking the presents he found under the Christmas tree (木) in the elevator's kitchen (e2). He found lots of walnuts (核), but he doesn't know whether there are kernels or stones (核) inside. Fortunately he also unpacked a boar (亥) which sniffs at the walnuts and, after the careful examination (核), tells Hamlet what's inside.

核 = 亥 + 木 : Hamlet (h) is unpacking the presents he found under the Christmas tree (木) in the elevator's kitchen (e2). He found lots of walnuts (核), but he doesn't know whether there are kernels or stones (核) inside. Fortunately he also unpacked a boar (亥) which sniffs at the walnuts and, after the careful examination (核), tells Hamlet what's inside.

四 = 儿 + 囗 : Mnemonic symbol: a four-leaved clover. Socrates (s) is working out in the bathroom of the space station (Ø4). He's lifting four (四) wooden boxes (囗), and wonders why they are so heavy. He doesn't know that inside one of the four boxes, the monkey king (儿) is hiding and secretly laughing at him - until the monkey king comes out and surprises Socrates with a four-leaved clover (四).