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OTL, Arabs won 2 major battles in 636. Yarmuk and Qadisiyya.
Was either of them inevitable?
Suppose Arabs lose?
What butterflies would be required to cause the following outcome:
- Arabs lose at Yarmuk, still win at Qadisiyya
- Arabs win at Yarmuk, lose at Qadisiyya
- Arabs lose both
What would happen after each of the three?