Random observation:
The name of the Persian king Artahshasta (Artaxerxes) is spelled
ארתחששתא
in Ezra 4 and 6 (five times) but spelled
ארתחשסתא
in Ezra 7-8 (five times). If sin and samekh were pronounced the same at that point, I would expect interchanging, not perfect division.
#HebrewBible #Ezra