Breakthrough in world's oldest undeciphered writing

[Yo_Mama]

3. I don't think Indus script is properly considered a writing system, but sort of a labeling system.

There don't seem to be long writings in the symbols:
https://en.wikipedia.org/wiki/Indus_script

The first publication of a seal with Harappan symbols dates to 1875, in a drawing by Alexander Cunningham.[5] Since then, over 4,000 inscribed objects have been discovered, some as far afield as Mesopotamia. In the early 1970s, Iravatham Mahadevan published a corpus and concordance of Indus inscriptions listing 3,700 seals and 417 distinct signs in specific patterns. The average inscription contains five signs, and the longest inscription is only 17 signs long. He also established the direction of writing as right to left.[6]