亻
=
丿
+
丨
:
Mnemonic symbol: Rosa Luxemburg. She's quite radical, and her name starts with "r", just like "ren2". Also, 亻appears at the left-hand side of characters, and Rosa is a leftist as well.
Robinson Crusoe (r) and Rosa Luxemburg (亻) are having their favorite snacks in the encampment's kitchen: Rosa is eating a banana (丿) and Robinson is eating a dinosaur bone (丨).
曹
=
一
+
曰
+
曲
:
Mnemonic symbol: a Chinese / white herring.
The King of Chu (c) called Cao Cao too often (曹) and now he's about to enter the aorta (ao2). To pay him respect the King of Chu plays a flute (一) and the Chinese / white herring (曹) plays a harp (曲). They also record their performance with a microphone (曰).
曹
=
一
+
曰
+
曲
:
Mnemonic symbol: a Chinese / white herring.
The King of Chu (c) called Cao Cao too often (曹) and now he's about to enter the aorta (ao2). To pay him respect the King of Chu plays a flute (一) and the Chinese / white herring (曹) plays a harp (曲). They also record their performance with a microphone (曰).