y = ǀ x + 2 ǀ - 1, y = ǀ x - 3 ǀ - 4, y = - ǀ x ǀ + 2, y = ǀ x - 2 ǀ - 1, y = ǀ x + 2 ǀ + 1, y = ǀ x + 3 ǀ - 4, y = - ǀ x + 2 ǀ, y = ǀ x - 4 ǀ - 3, y = - ǀ x - 4 ǀ + 3, y = - ǀ x + 2 ǀ - 1,

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