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// Empty
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hull();
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// No children
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hull() { }
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hull() {
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cylinder(r=10, h=1);
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translate([0,0,10]) cube([5,5,5], center=true);
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}
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translate([25,0,0]) hull() {
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translate([0,0,10]) cylinder(r=3);
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difference() {
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cylinder(r=10, h=4, center=true);
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cylinder(r=5, h=5, center=true);
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}
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}
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