6 triplets form the base of the first half year part of the calendar. With red are marked significant numbers, 'proving' this is the correct structure. The first triplet (1, 2, 3) has 19 glyphs, an odd number which indicates that the triplet cannot be regarded as isolated from the rest. It cannot be 'finished' having an odd number of glyphs.

Therefore we have to search for another triplet with an odd number of glyphs, and we must go to the triplet 10, 11, 12 (with 7 glyphs together). That 'closes' the group which will have 42 glyphs, a highly signficant number.

The 12 first periods must belong together. Therefore the next 6 periods (13-18) will form another group. The two groups have 70 glyphs together and half 70 = 35, a number we find as the sum of the first 9 periods. This way the periods are also evenly divided into two groups with 9 periods and 35 glyphs in each group. On Easter Island 70 and 35 are significant numbers, too.