[Gmsh] How to obtain Hexahedron20

[Julia Fischer]

Dear List


I have a very simple  geo file  and I would like to  get  a mesh with
Hexahedro20 , but I only get Hexahedron27

Thanks in advance !

Cheers

Julia !!

my command is:
%> gmsh -3 -order  file.geo

file.geo:

     Point(19) = { 20,30.0,85.0 };
     Point(20) = { 20,35.0,85.0 };

     Point(21) = { 20,25.0,100.0 };
     Point(22) = { 20,35.0,100.0 };

     Line (24) = { 19,20 };
     Line (26) = { 20,22 };
     Line (27) = { 21,22 };
     Line (25) = { 19,21 };


     Line Loop (8) = { 24,26,-27,-25 };
     Plane Surface(8) = { 8 };

     Transfinite Line { 24 }= 6;
     Transfinite Line { 26 }= 6;
     Transfinite Line { 27 }= 6;
     Transfinite Line { 25 }= 6;

Transfinite Surface {8} = {};
Recombine Surface {8};

Extrude{-8,0,0} {
 Surface{8};
 Layers{1};
 Recombine;
}
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