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).
廷
=
壬
+
廴
:
Mother Teresa (ti) builds her own private courtyard (廷) out of four go-boards (廴) in the engine's kitchen ((e)ng2). To be specific, she builds the courtyard for her cat o' nine tails (壬).