Ascher Databook Notes:
  1. By spacing, the khipu is separated into 9 pairs of pendants.
  2. Assuming that pendant 18 has value 29, the sum of the values on the first pendants in each pair equals the sum of the values on the second pendants. That is:
    \[ \sum\limits_{i=1}^{9} P_{2i-1} = \sum\limits_{i=1}^{9} P_{2i} \]
    where Pi is the value of the ith pendant.