讶

讶 = 牙 + 讠 : Maud Younger (y) is astounded (讶) to find that her removed wisdom teeth (牙) are advertised for sale on an advertising column (讠) in the ashram's bathroom (a4).

Mnemonic symbol: wisdom tooth. Maud Younger has a wisdom tooth removed just inside the ashram's kitchen.

Mnemonic symbol: this character looks like a big "i" (like in information), and I'll represent it by an advertising column. Maud Younger (y) gives a speech (讠) standing on top of an advertising column (讠) in the anthill's kitchen (an2).