See my treatise, "Die Schlangenzahlen in der Dresdener Mayahandschrift" (Weltall, year 5, pages 199-203).
Several details show how this number-structure forms a definite, closely connected whole.
1. The beginning day in each case is the day Kan, which thereby indicates its position as the first.
2. The last three starting-points are the same; the first three end dates, at least, are the same in the Tonalamatl, though not in the year.
3. The two numbers 2b and 4b are exactly the same.
4. The first three numbers are each divisible without a remainder by 17, the interval from XIII Akbal to IV Ahau, which was true also of the 1,268,540 in the second column on page 63, although only this last number has anything to do with these important days, of which the other three numbers are independent.
On the other hand, a notable difference between the first serpent and the other three is, that the day XI Kan is the starting-point of the first and IX Kan of the others. There are, however, 80 days between IX Kan and XI Kan. Hence the numbers 2a and 1b are separated from each other by 66,640 = 256 × 260 + 80, although they have the same end III Chicchan.
Further it is to be noted that the largest of the eight numbers, 12,489,781, is separated from the lowest, 12,388,121, i.e., the black number from the red one of the first serpent, by only 101,660, i.e., by not a full one per cent of the entire magnitude. 101,660 = 5 × 18,980 + 26 × 260 or 391 × 260 or 7820 × 13.
It is to be noted also that the differences between the black and red numbers in the second and third serpents (60,021 and 28,132) are divisible by 13 (4617 × 13 and 2164 × 13). They must be, since all six numbers refer to the day III.