linear_extrude(height=4){
    polygon([
        [-5.5,0.0],
        [0.0,0.0],
        [0.0,6.0],
        [7.5,6.0],
        [7.5,-20.0],
        [15,-20.0],
        [15,-14.0],
        [14,-14.0],
        [14,-18.0],
        [9.5,-18.0],
        [9.5,8.0],
        [-5.5,8.0],
        [-5.5,0.0]]
    );
}