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\subsubsection{Other measurements}  The very large statistics accumulated at TLEP, including $3 \times 10^{10}$ tau pairs or muon pairs, or more than $2 times \times  10^{11}$ b quarks or c quarks should allow a new range of searches for rare phenomena and tests of conservation laws that remain to be investigated. As an illustration, about 100 ${\rm B_s \to \mu^+\mu^-}$ decays and more than 20,000 ${\rm B_s \to \tau^+\tau^-}$ decays would be observed, according to the Standard Model predictions. It will be the purpose of the upcoming design study to examine and develop further the immense physics potential of TLEP-Z.