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\subsection{Upgrades and Higgs \subsection{Higgs  physics at Higher Energy} It is not yet excluded to extend the centre-of-mass energy of the ILC by another factor of two towards $\sqrt{s} =$ 1 TeV, with a significant cost increase of about five billion dollars over the baseline project. Another linear collider project, CLIC~\cite{cite:CLICDR}, could also take over for the high-energy physics programme all the way to $\sqrt{s}=$ 3 TeV. It would require, however, a prohibitively-high electrical power of $\sim 600$~MW.   The foreseen energy ultimate energy-frontier  upgrade of TLEP is of another, unique, and more ambitious, nature. It would consist in re-using the 80-to-100 km tunnel for a very-large-energy large hadron collider (VHE-LHC). If instrumented with magnets of 15 T, pp collisions would be produced at a centre-of-mass energy of 80 to 100 TeV. For completeness, pp collisions with a centre-of mass energy of 33 TeV, which would be obtained by re-using the LHC tunnel for a high-energy hadron collider (HE-LHC), are also addressed here.