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).
矣
=
厶
+
矢
:
Mnemonic symbol: the finals of a TV show.
Maud Younger (y) made it to the finals of a TV show (矣) and is facing her last challenge in the space station (Ø3). With a fake nose (厶) covering her face she'll have to smell different darts (矢) and guess which dart player had it in his or her hands last.