- all triangles in the 1-6 and the 1-12 add up to even numbers
- there are six pairs of identical triangles containing the number 1
- the other six form three identical pairs of triangles

- (blue in triangle, green in hexagon, black in circle)
(1, 6, 5), (2, 1, 5), (3, 1, 6), (3, 2, 1), (4, 3, 1), (1, 5, 4) are pairs
(5, 3, 2), (5, 4, 3), (6, 5, 3) are pairs

- triangle sum distribution is as follows:
6 - 2, 8 - 4, 10 - 6, 12 - 4, 14 - 2
- top to bottom is mirrored and sums are: 6 + 14 = 20 and 8 + 12 = 20