When asked about the aid levels, Miller acknowledged Israel has “failed” to meet US requests so far but said there was still time until the 30-day deadline and that the US wouldn’t give a “grade” to Israel just yet. “It’s not the end of the semester. You don’t give out – you don’t hand out grades in the middle,” he said while laughing.
Calling that a joke seems… generous.
I think they probably do, but like other early forms of record keeping, the focus definitely seems to be numbers. IIRC there are some knots that just don’t look like numbers.
The Chinese also used knots to record details of events, not just numbers, but the system that is used to decode the knots was complex enough that it functioned like a cipher - without already knowing how they did it, there’s just no way you’d be able to work it out.
I can’t recall the details but I think it’s covered in the Ancient Americas video on the khipu on youtube.