How does Englander use repetition in the novel, Dinner at the Center of the Earth?

In the novel, Dinner at the Center of the Earth, characters are relentless in their pursuit of the “enemy.” The repetition of the phrase “the enemy” reinforces the ubiquitous enemy-making amongst all characters. The “enemy” is always described as occupying the opposing “side,” or being “from the other side” (18). Physical barriers and borders exist to separate one’s people from one’s enemies.