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B r_{2}

\frac{1}{2} B r_{2} (I) \to B r (I)

\frac{1}{2} B r_{2} (g) \to B r (g)

\frac{1}{2} B r_{2} (a q) \to B r (a q)

\frac{1}{2} B r_{2} (I) \to B r (g)

ANS : 2

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