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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 $3 \times 10^{11}$ 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, several hundreds up to thousand  of ${\rm B_s \to \tau^+\tau^-}$ events could be observed assuming a branching ratio as the one expected in the SM. It will be the purpose of the upcoming design study to examine and develop further the immense physics potential of TLEP-Z.