俅

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).

求 = 永 : Mnemonic symbol: a service request bell. You know, the kind you find in a hotel on a service counter.

求 = 永 : In the outhouse's kitchen, the Queen of Hearts sees a diamond ring and wants to have it immediately. Determined she rings the service bell endlessly to request the immediate handover.