1group();
2group();
3group();
4group();
5group();
6group();
7group();
8group();
9group();
10group();
11cube(size = [1, 1, 1], center = false);
12sphere($fn = 0, $fa = 12, $fs = 2, r = inf);
13cylinder($fn = 0, $fa = 12, $fs = 2, h = inf, r1 = -inf, r2 = -inf, center = false);
14group();
15group();
16group();
17
18