Show that 11+a+b-1+11+b+c-1+11+c+a-1=1.

Show that $\frac{1}{1 + a + b^{- 1}} + \frac{1}{1 + b + c^{- 1}} + \frac{1}{1 + c + a^{- 1}} = 1$ .

Match the items on the right to the items on the left.

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