I would like to know the mechanism of this reaction. In my first attempt to the question, I had replaced the two $\ce{Br}$s by $\ce{CH3}$s by $\ce{S_N2}$ of the organometallic compound but the answer given was the above allene. I think my reaction isn't possible because of too much hindrance. So if that's the case, then what is the mechanism of the actual reaction?
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