So ... there is one now ...
and it can easily be used to create an alphabet, for instance,
if we wanted to pretend that Incas were very close to having a writing system 😉
Illustrated here :
Dynamically explained here :
Few more explanations, google slides, static :
https://drive.google.com/open?id=1lIBZwoow8dBqOpw76z77pMInW69KAHTJDgJPanDyrxs
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and...
other links to attempts of the same kind (new number notations) from other folks:
