v1 = vector([1, 0, 2, 2, 0, 4, 4, 0, 10]) v2 = vector([0, 1, 1, 3, 3, 2, 3, 2, 5]) v3 = vector([1, 2, 4, 8, 6, 8, 10, 4, 20]) v4 = vector([1, 2, 0, 4, 10, 0, 6, 20, 0]) v5 = vector([0, 1, 3, 3, 5, 10, 9, 10, 11]) v6 = vector([1, 4, 6, 10, 20, 20, 24, 40, 22]) v7 = vector([1, -1, 1, -1, -3, 2, 1, -2, 5]) v8 = vector([0, 1, -2, 1, -2, 0, 4, 0, 4])