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    Mesh.Algorithm   = 7; // bamg
    Mesh.Algorithm3D = 7; // mmg3d
    a = 0; c = 0; f = 0;
    b = 1; d = 1; g = 1;
    n = 10;
    hloc = 1.0/n;
    Point(1) = {a, c, f, hloc};
    Point(2) = {b, c, f, hloc};
    Point(3) = {b, d, f, hloc};
    Point(4) = {a, d, f, hloc};
    Point(5) = {a, c, g, hloc};
    Point(6) = {b, c, g, hloc};
    Point(7) = {b, d, g, hloc};
    Point(8) = {a, d, g, hloc};
    Line(1) = {1,2};
    Line(2) = {2,3};
    Line(3) = {3,4};
    Line(4) = {4,1};
    Line(5) = {5,6};
    Line(6) = {6,7};
    Line(7) = {7,8};
    Line(8) = {8,5};
    Line(9)  = {1,5};
    Line(10) = {2,6};
    Line(11) = {3,7};
    Line(12) = {4,8};
    Line Loop(21) = {-1,-4,-3,-2};
    Plane Surface(31) = {21} ;
    Line Loop(22) = {5,6,7,8};
    Plane Surface(32) = {22} ;
    Line Loop(23) = {1,10,-5,-9};
    Plane Surface(33) = {23} ;
    Line Loop(24) = {12,-7,-11,3};
    Plane Surface(34) = {24} ;
    Line Loop(25) = {2,11,-6,-10};
    Plane Surface(35) = {25} ;
    Line Loop(26) = {9,-8,-12,4};
    Plane Surface(36) = {26} ;
    Surface Loop(41) = {31,32,33,34,35,36};
    Volume(51) = {41};
    Physical Surface("bottom") = {31};
    Physical Surface("top") = {32};
    Physical Surface("left") = {33};
    Physical Surface("front") = {35};
    Physical Surface("right") = {34};
    Physical Surface("back") = {36};
    Physical Volume("internal") = {51};