The alchemist
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The language tree was from the works of Christopher Ehret and a Somali researcher:No.
I think the person who wrote this meant Dabarre instead of Geelidle because the latter is a Mirifle subclan who speak the local Reewin (aka Af Maay) language. Basically Geelidle don't have a unique language but Dabarre do and they're missing from the tree.