刂
=
丨
+
亅
:
Mnemonic symbol: a kitchen knife. Don Quixote (d) is showing off his special knifes in front of the aorta (ao1). One is made from a dinosaur bone (丨), and the other is made from a crowbar (亅).
岁
=
夕
+
山
:
Susan Saint Bernard (su) meets a bat (夕) in the bathroom of the Eiffel Tower (ei4). They make a bet: The one who is older (岁) will be allowed to eat the other using a fork (山).