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r+(1/((1/r)+(1/(r+(1/((1/r)+(1/(r+(1/((1/r)+(1/(r+(1/((1/r)+(1/(r+R))))))))))))))))
r+(1/((1/r)+(1/(r+(1/((1/r)+(1/(r+(1/((1/r)+(1/(r+(1/((1/r)+(1/(r+R))))))))))))))))
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