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Because Yamnaya was 1/3(?) CHG and CHG is the closest to Zagros farmer although different. I would consider the branch migrating out of Yamnaya to the east of Caspian the original Indo-Iranian because that's the first of the domino stones but your approach is also correct. IE/BMAC hybrids can be considered the first Iranians, but the out-of-Yamnaya branch must be considered the proto-Indo-Iranians then.
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