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difference()
{
translate([56,-8,1.2]) cube([33,12,3]);
for ( x = [1.2:.1:1.8] )
translate([x*50,-5,0]) cylinder(r=x, h=5, $fn=50);
for ( y = [2.0:.1:1.4] )
translate([y*44,0,0]) cylinder(r=y, h=5, $fn=50);
}