i1 : O = 0_(PP_(ZZ/101)^{2,1});
o1 : ProjectiveVariety, empty subscheme of PP^2 x PP^1
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i2 : X = random({2,1},O);
o2 : ProjectiveVariety, surface in PP^2 x PP^1
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i3 : Y = random({1,1},O);
o3 : ProjectiveVariety, surface in PP^2 x PP^1
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i4 : Z = X + Y;
o4 : ProjectiveVariety, surface in PP^2 x PP^1
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i5 : assert(Z \ X == Y and Z \ Y == X)
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