A molecule (" $P$ ") on treatment with acid undergoes rearrangement and gives ("Q"). ("Q") on ozonol

Question

A molecule (" $P$ ") on treatment with acid undergoes rearrangement and gives ("Q"). ("Q") on ozonolysis followed by reflux under alkaline condition gives (" $R$ "). The structure of (" $R$ ") is given below :\ The structure of (" $P$ ") is\

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(b,c):\