[referring to the physical beating they had to give to the soldier with claustrophobia] We do it quickly and mercilessly, and at last he sits down quietly. The others have turned pale; let’s hope it deters them.
There are no more uses of "deter" in the book.
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She was slow to decide what to do, but once she did nothing could deter her from her chosen course of action.
The goal is to catch and punish enough tax cheaters to deter others from trying to cheat on their taxes.