lcar = .9;

Point(1) = {1,0,0,lcar}; Point(2) = {1,1,0,lcar};
Point(3) = {0,1,0,lcar}; Point(4) = {0,0,0,lcar}; 
Point(5) = {1,0,1,lcar}; Point(6) = {1,1,1,lcar};
Point(7) = {0,1,1,lcar}; Point(8) = {0,0,1,lcar};

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(13) = {1,2,3,4};       Plane Surface(14) = {13};
Line Loop(15) = {5,6,7,8};       Plane Surface(16) = {15};
Line Loop(17) = {1,10,-5,-9};    Plane Surface(18) = {17};
Line Loop(19) = {-3,11,7,-12};   Plane Surface(20) = {19};
Line Loop(21) = {2,11,-6,-10};   Plane Surface(22) = {21};
Line Loop(23) = {-4,12,8,-9};    Plane Surface(24) = {23};

Surface Loop(25) = {14,16,18,20,22,24} ;

Volume(26) = {25} ;

Physical Volume (27) = 26 ;
