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module up() {
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translate([0,0,1]) child(0);
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}
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module red() {
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color("Red") child(0);
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}
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up() cylinder(r=5);
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translate([5,0,0]) up() up() cylinder(r=5);
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translate([10,0,0]) up() up() up() red() cylinder(r=5);
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translate([15,0,0]) red() up() up() up() up() cylinder(r=5);
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