Answer:
U MEANS UNION
{-8,-4,0,4,8,12,16,20} U {-3,-2,-1,0,1,2,3,4,5,6} BECOMES
{0, 1, 2, 3, 4, 5, 6, 8, 12, 16, 20, -1, -8, -4, -3, -2}
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