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13 - 2y - 2 ≥ y + 1 - 8
-2y + 11 ≥ y - 7
-2y - y ≥ - 7 - 11
-3y ≥ - 18
3y ≤ 18
y ≤ 18 / 3
y ≤ 6
HP : {6, 5, 4, 3, 2, 1}