If a,b,c,a, b, c,a,b,c, and ddd are integers such that a+b+c+d=30a+b+c+d=30a+b+c+d=30 then the minimum possible value of (a−b)2+(a−c)2+(a−d)2(a - b)^{2} + (a - c)^{2} + (a - d)^{2}(a−b)2+(a−c)2+(a−d)2 is
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