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- Integrate[If[a^2 + b^2 + c^2 + d^2
- + Sqrt[((b+c)^2 + (a-d)^2) ((b-c)^2 + (a+d)^2)] <= 2, 1, 0],
- {a, -1, 1}, {b, -1, 1}, {c, -1, 1}, {d, -1, 1}]
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