[Gmsh] ΗΕX element type only

[Mazanakis george]

Hi everyone
I am new in gmsh and I am apologies for my simple question

I want to know How (if) I can create a model which has only HEX element (c3d20 in abaqus format) 
For example I have create this simple model. So when I create the mesh except from the hex element (c3d8)  threre are and quadrangles element. 

In conclusion How I can use only one type of element (c3d20)? 
ps
There is and another similar question but I canot understand what I have to do.

I hope for your Help
M.G.

cl__1 = 0.1;
Point(1) = {0, 0, 0, 0.1};
Point(2) = {1, 0, 0, 0.1};
Point(3) = {1, 1, 0, 0.1};
Point(4) = {0, 1, 0, 0.1};
Point(5) = {1, 1, 1, 0.1};
Point(6) = {0, 1, 1, 0.1};
Point(10) = {0, 0, 1, 0.1};
Point(14) = {1, 0, 1, 0.1};

Line(1) = {1, 2};
Transfinite Line {1} = 4Using Progression 1;
Line(2) = {2, 3};
Transfinite Line {2} = 4Using Progression 1;
Line(3) = {3, 4};
Transfinite Line {3} = 4Using Progression 1;
Line(4) = {4, 1};
Transfinite Line {4} = 4Using Progression 1;
Line(8) = {5, 6};
Transfinite Line {8} = 4Using Progression 1;
Line(9) = {6, 10};
Transfinite Line {9} = 4Using Progression 1;
Line(10) = {10, 14};
Transfinite Line {10} = 4Using Progression 1;
Line(11) = {14, 5};
Transfinite Line {11} = 4Using Progression 1;
Line(13) = {3, 5};
Transfinite Line {13} = 4Using Progression 1;
Line(14) = {4, 6};
Transfinite Line {14} = 4Using Progression 1;
Line(18) = {1, 10};
Transfinite Line {18} = 4Using Progression 1;
Line(22) = {2, 14};
Transfinite Line {22} = 4Using Progression 1;
Line Loop(6) = {3, 4, 1, 2};

Plane Surface(6) = {6};
Transfinite Surface {6};
Recombine Surface {6};


Line Loop(15) = {3, 14, -8, -13};
Ruled Surface(15) = {15};
Transfinite Surface {15};
Recombine Surface {15};


Line Loop(19) = {4, 18, -9, -14};
Ruled Surface(19) = {19};
Transfinite Surface {19};
Recombine Surface {19};


Line Loop(23) = {1, 22, -10, -18};
Ruled Surface(23) = {23};
Transfinite Surface {23};
Recombine Surface {23};

Line Loop(27) = {2, 13, -11, -22};
Ruled Surface(27) = {27};
Transfinite Surface {27};
Recombine Surface {27};

Line Loop(28) = {8, 9, 10, 11};
Plane Surface(28) = {28};
Transfinite Surface {28};
Recombine Surface {28};

Surface Loop(1) = {6, 15, 19, 23, 27, 28};
Volume(1) = {1};
Transfinite Volume(1);
Recombine Volume(1);
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