Ascher Databook Notes:
  1. This is one of several khipus acquired by the Museum in 1907 with provenance Ica. For a list of them, see AS100.
  2. Some values on the khipu are sums of values on later consecutive pendants. Namely:

    P1 = P3 + P4
    P4 = P5 + P6
    P6 = P9 + P10 + P11
    P7 = P8 + P9 + P10 + P11

    One value is the sum of the squares of values on later consecutive pendants:
    \[ P_{2} = \sum\limits_{i=4}^{11} P_{i}^2 \]